Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cbaccdc54904c6…

MALICIOUS

PDF

97.1 KB Created: 2021-09-19 11:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5bac411b36792f494e4f0cebbc113885 SHA-1: 42eec021201a8dd70d809d5b20cbfff693310d34 SHA-256: 44cbaccdc54904c6878c00c6773c9aeeb692c785bfae9fd4484fa08c17bdd1f1
172 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a visual download button further supports a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=the+hitman+wife+bodyguard+full+movie PDF link annotation
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/23a2704358df17a0f724fb6baf79d39b/21753584227.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/30779831511.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/91103346144.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/funijogaxusudoris.pdfIn PDF document text
    • http://chayka-svg.ru/files/vazubujolejukunu.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/tusezobolubodiboxesaga.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/4575559894.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f249bba9e---ladosogafezozawavejefoxu.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/lijugijogese.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/445e7d43d74d2917f836e94c161d558c/55342984099.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/zapavil.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/kupoboruja.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458e2a4dcaa---rikasalumapinonegetilul.pdfIn PDF document text
    • http://jyczgj.com/UploadFiles/file///2021091720472826.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/sokijarokugumifeb.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/tiguriluvetowemeliluzum.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/44861094853.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d7fbbad8c---taxewomizuxamizasew.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/29321698165.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/37274045395.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/88962852831.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/31960188065.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_off000111c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 11100 bytes
SHA-256: b04b2dce939ba3bcdacda015e495a3e9c7a4195190f6f60f3f6ea08c3043ad02
font_01_sfnt_off00012b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14356 19340 bytes
SHA-256: 44141705d0237997f08c5454346b6e1c2c135997d41ddd66e94e44e15ea72659

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