Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2d9de9b2ca9bc1…

MALICIOUS

PDF

104.0 KB Created: 2021-08-04 20:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d058afd6c391d019a4c5a288ac34227 SHA-1: 3435706c32201ac2c17f519a7194a6ef1b8aa5b3 SHA-256: fc2d9de9b2ca9bc153085ba8c37382e3236f123203c8479718573e48c8380b13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many pointing to compromised WordPress uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=how+to+write+exam+leave+application+for+office PDF link annotation
    • https://tonitomov.com/picture/file/48934968352.pdfIn PDF document text
    • http://alvitraders.com/files/91252365614.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0949b77bbeebf0e062bc7cb2b79c3d37/kefafovu.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/gegima.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ec3270416---zamina.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/98251568879.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854d352a058---rowuka.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608950efbcf1f---59542182302.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/birobuloxijut.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/4783425088.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/77590308480.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/eb5e958c437786bc7bee30a023ac3f98/bolawenezaponela.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9c1ec9bf4---54558844608.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/43126026818.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/dederujoses.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210727_223443.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/k22t4svdjmkp6ug7nt5urv0re2/50471860843.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/79015452058.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1cc9d779ed4da8ae03e6b49341b90264/44196000211.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c97030ce784---nokadu.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7qfb2l3spd55nnakkeikhid4fu/41088491046.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/b5e5e3f54b2dffd8871470a4de11fa6a/sifezedifemivibosununo.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_off000130e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E0 18120 bytes
SHA-256: 7451a61ac100b3e2d99ff8070833e460ac929f7c6bc489f4277d2eb6aa27e5ef
font_01_sfnt_off00016086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001789d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1789D 10720 bytes
SHA-256: c574ca8d8a44e6344164eec0f90627ebb5ec5d984bac0b778b0d8be7130aa886

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