Malicious PDF — malware analysis report

Static analysis result for SHA-256 4729b60d67cfe3f2…

MALICIOUS

PDF

70.2 KB Created: 2021-06-24 21:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0f9366eea1aa292708f31898d25800e SHA-1: 9585732b0f39dc7c9232f06410ec449337bdb8c4 SHA-256: 4729b60d67cfe3f21304935150e8bb40b24954f5a6d83c9906888904998c5e4f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an effort to obscure the ultimate destination. The document also includes a lure to copy/paste content into a command-line context, which is a common tactic for executing downloaded payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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=video+converter+mp4+to+avi+free
    • http://sun-eko.eu/files/file/sabififaxumatalitinegabo.pdf
    • https://cuisinescartier.ca/upload/editor/file/nulalerupebujo.pdf
    • https://master-service.ro/images/file/bagazek.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/87b222afa426ecd3f1aaf07ca9f75867/bezirezukavotobaroref.pdf
    • https://aimhc.com/userfiles/file/satupavu.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d57c423337a7d5cd336ed5e935c25027/magimabuxanano.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca86619e3d---68715117059.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b8c9b365029e5d813c44bd17257ab3f/kumazawiwonenaxipe.pdf
    • https://sanxuattrucauthangkinh.com/Images_upload/files/vajuwajozu.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/cv25elu0gntm3n0d41alld6870/5324625004.pdf
    • https://bczenekar.hu/files/file/kiroregojoboxi.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6euhcctaub241ef8u12c6htkg9/tapifasuleredaro.pdf
    • https://pima-alarms.rs/slicice/file/munelobemovo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62d.bin
31e0074d611f8b68b3d085b071eca04422870d0fc65e97bd8449b596657af176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 5204 bytes
font_01_sfnt_off0000e7db.bin
20ba3c5dc6b8cd564cb3b7f025a8645ee3cd121e0cd392bc855187e5dc54eedf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 10656 bytes

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