Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae32b66d4bad5775…

MALICIOUS

PDF

78.5 KB Created: 2021-09-03 21:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f63db21285cdc5c82102cac15e2a486a SHA-1: 349a601299dceff6499ed51064b02d1a4826ce8d SHA-256: ae32b66d4bad57750d9cfbec90e10acb3fda0194c64e897ca224e52db1daf9ad
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or tech-support scam. It contains a link farm and embedded URLs, with several pointing to compromised WordPress sites and potentially disposable hosting. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document prompts the user to call a phone number, a common tactic for social engineering attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://cansuyu.org/resimler/files/bidenubofafir.pdf In PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf106d0670---lojesafuximemar.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/14428794080.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088577e8da7e---74772273209.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/62805135666.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608153b8d14dc---86113905181.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084507180d9d---ribelebufoxuno.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/99524393582.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/59965056061.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/25c6ca9b647f2db7152829796bf21555/59207793382.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/nemalil.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e9e3e590---nezofifogesokutupokogu.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/87120251208.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/mrmfb4lo0f7fglf4gf921niqua/88668784415.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/8nmu3t3268l7c8b28ucdd899j0/36108681644.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/527339ebaf84514a027197881769a9bb/mefazoneve.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160adef49bb340---57801473335.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/p4k6qhkhnj2ioebvgtt37r3li5/wusogagovekowenig.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/40859392721.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/55045246249.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/57815131201.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f87a8862d---78342617149.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/60317010464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=accounting+and+finance+for+bankers+ns+toor+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD40 17552 bytes
SHA-256: e97b05f0a35cefda60f343a63afeafdf75eef36bf34bfb45c8afa6f6d201ca61
font_01_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 11060 bytes
SHA-256: 8b963300feb600583739bb3b5934bac164f985a8a17398f9f38f10b5f80e0811
font_02_sfnt_off0001140d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1