Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ecdc57d83a45f9…

MALICIOUS

PDF

84.7 KB Created: 2021-08-15 08:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 57e5f49fcec64351ad26bb9b984963a3 SHA-1: ac245366e24230a60a9e2ab911a7eee66358ddb0 SHA-256: 23ecdc57d83a45f9a2b02c5f6002a244f02d0c766c2be9d4deeb087a70a76d7a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting an attempt to distribute further malicious content. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely provides instructions to decrypt a payload, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://pixomot.ru/uplcv?utm_term=convertir+pagina+web+a+pdf+online PDF link annotation
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1be3732ce86285f51227940d46971a97/90950858134.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/63aee2e3785ad598531ab3860edb0641/42762123115.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/91452366797.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/41195360758.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/goweramesa.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3eaafe2d04b20e9d5d3572972877661e/ziritifuwifux.pdfIn PDF document text
    • https://paperland.bg/uploads/file/deladutejinupuw.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/bumadul.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210510031052_888203979.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/texopoxalezulixovezeza.pdfIn PDF document text
    • http://finchamauto.com/pics/fitukamusazexivedikor.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/bifelulizebevuguwuwel.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e48fc2f0168---pezoribaxumowakuxugujis.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609181c681e81---vesipadidezokarefe.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/rufudojojasikikama.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff16219731---legebev.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0671e4ba72---xibawasasibibaxixoteb.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074615b9d1d2---rekegujexapumufawusop.pdfIn PDF document text
    • https://ms02bet.net/contents//files/39547314700.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/jaxilavulitipojagoka.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/milenipesasukatabanena.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/0352a858b55747005224ff7b6c1161b1/78230982556.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cbc4bf009---kesudosudaxosoxaveki.pdfIn PDF document text
    • http://fitviewer.biz/files/file/90016467636.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/piragiluzobutuvugarazefed.pdfIn PDF document text
    • 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_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 10828 bytes
SHA-256: e2135ecb140018252b42c8fc7c1d9cbbefe1c7b4baf8609ed590bface72e6ae4
font_01_sfnt_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 17924 bytes
SHA-256: 913568cf7a2ca8872f8e1aab95f84757cd6706af02c2225dcf930e0c548dbf05
font_02_sfnt_off00012b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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