Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43d4146c3a47b4d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 14:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b0cf1bdf3f8a211efb892f0a8747009 SHA-1: b5cecd1c16cbf9a170659386ca5eeb386a27d6cc SHA-256: a43d4146c3a47b4d67393c025d3916ff275d96c0803958ae9a61b4ed530fe436
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or host phishing pages. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic indicate a phishing or scam attempt, likely to trick users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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://pirkitpadangas.lt/ckfinder/userfiles/files/21375475003.pdf In PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/70882290040.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/54513397248.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/deguxitoredegeranedebugob.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ju0j3q06p09nd036h6r8pvfdr9/24444605006.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/97c72mfjddtrhl4gs5ujqc6973/jotemubijuwesumosejoj.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/guvesavidi.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3a2997d5e3b84b17b4e9ad27d8e1c7e7/90777618429.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/wugisoru.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/92314398449.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/vinotuzojevotegu.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/db68dabab147718daa48b9d53e3fccf4/72714037827.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/2035026583.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/mufasabizizosogod.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e75f4c59cb---jajudalozotinobe.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4u0q311f3h9031vqcrkg5n35dn/tusodajosofajaf.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210829100651.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/44773751360.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096d7446e8df---dipitebowobitubata.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/8b5ef4ce885daa6942f4f52c0de27a0d/bugutobonuleriwakaso.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df5acd07a4---27719877969.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/vudoxewewebaziletixemuwup.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/lemapabefarulukijukugurob.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f3ae7a4e206---45006432122.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d1414a5e675e50eede8c69411e9258ef/10054324896.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/romasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sai+satcharitra+chapter+telugu+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC83 20752 bytes
SHA-256: f9a839c6b335139a1fac3fa61985b4b137e0936845d87d3c905ae443af0031b8
font_01_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 10848 bytes
SHA-256: dcf2770948725bd81039991477f61e60c6d497a509a403e1786bdb8fd4d8d9d6
font_02_sfnt_off00011b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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