Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0efe3abf38f9349…

MALICIOUS

PDF

84.5 KB Created: 2021-07-17 08:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4e6753ee9b4d04742166de14a69e71ac SHA-1: d6db5c1e2a1938a371bddef9cc7dfadb1a8934c5 SHA-256: d0efe3abf38f9349bf5f33aa386804e7b6b7aa8ac2d6130f8378b06efcbb09be
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of embedded URLs and link farm heuristics indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075ace65003f---bisepanonup.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4873109ab4---bovenadufigipope.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/30607167661.pdfIn PDF document text
    • https://stopserv.ru/files/file/2356758223.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b511f8a6575ffc304e545d72c8925392/fisesomukedo.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/6669e0b646139df11cb69073e71649d4/75966304674.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/89257481966.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/13490294559.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/rajidanaxifogido.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/363203eb4963341d387335c8d9f349f6/17986341983.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/740uh61p287cjc8snef3hbqvo5/62792107254.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608872e22a383---nofadunogexubu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0130d42a63---jigetakitovuturifod.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/tofatefufinezuwumuxi.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/nuwuge.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/89df254378bba60a93c3dd7abe99bebb/69868395580.pdfIn PDF document text
    • http://castel.lu/userfiles/files/sokevemomodadi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607974c60163a---ziguvemu.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/birodelowonamobuzimado.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1662ac0a---gavod.pdfIn PDF document text
    • http://gistys.com/userfiles/file/zajafipimajipefupom.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/gekopenaruveva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=international+delivery+trackingPDF link annotation
    • 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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 16776 bytes
SHA-256: 4395e5d60c9ecdcfc53799505ed5464d93627ac8bae3098a40fd7565bfc7f49f
font_01_sfnt_off0001135b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B72 10600 bytes
SHA-256: 4166b2d4329cb44c4b033fe38f0d590981ca60fcdec8ebd069055610107ded40

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