Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b544dc180336be…

MALICIOUS

PDF

86.2 KB Created: 2021-08-26 02:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 294bd2c9e286dedcc95646af2924c70f SHA-1: fa1d6f6ca807c97557882f55ac4454d71c29eacd SHA-256: 23b544dc180336beb55f1c6cb1bd7b58d926acad66d70a83ce049382bcbf78ee
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits multiple indicators of malicious intent, including a high ML classification score and ClamAV detection as a phishing trojan. The document body, though heavily obfuscated, contains sequences suggestive of command execution and lures users with a download button and callback phishing pretext. The numerous embedded URLs point to compromised websites and link farms, likely serving as a distribution network for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=change+of+address+letter+template PDF link annotation
    • https://vicotelecom.vn/static/source/images/file/7666869151.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc458561eb0---80246101708.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/46925482740.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb12b5653---45994353403.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f2e0643976270d003b29f5c65d7d17e5/56015261792.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/sofekonibapiba.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/418fba78e2541d2b47f6021b11942d91/mezejopi.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/tilibojisasedefagerita.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/acc294fdc15d56562176cb866a88c4c5/96858980926.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1627906463.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/c1hoq89cp4jfjng2cmdmrkjrn1/52298660589.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0e6c91a5---93967592830.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/57826399312.pdfIn macro / runtime command snippet
    • http://katyababash.com/images/uploads/file/67004680583.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/xolijunuzideruba.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/papasexutesubuje.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/66463234160.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/22795903499.pdfIn PDF document text
    • https://superpart.com/files/71057055465.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f081e0cb5---85160260687.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/25badd20df0b57c9ab130ed26a54467e/xaxurubuvokofi.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/reverisujavujapojoluli.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1629930112482.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf720ec9d---fuzirilobodaki.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/bixesob.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-conIn macro / runtime command snippet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 10884 bytes
SHA-256: f1d3321697fbf99e8c2422dfe7aca36a5c4431bd378c307cb87c45a088e557c2
font_01_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 19352 bytes
SHA-256: 4b48210b6335dfcf77289efad08a4775deef86203e52cac71b6045d365dcdf83
font_02_sfnt_off0001326a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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