Malicious PDF — malware analysis report

Static analysis result for SHA-256 431caa158220ee3a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 15:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e004e995dc68fbecc36528bf4e9cb884 SHA-1: b258dd19c77b329b9b7cb69c2e4a710de0c51ae6 SHA-256: 431caa158220ee3aff739ebfcb065f5141a2f4eace8d656d0494280e6d3a6d0c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with several URLs pointing to potentially compromised WordPress sites or disposable hosting. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is designed to trick the user into making a phone call for fraudulent purposes, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://prabashproperties.com/ckfinder/userfiles/files/zexebofof.pdf In PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/7457806319.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/11717805023.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/20990929800.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/zimat.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132182cdedb6---wixazevadijabajanub.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/44262019335.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/doposokuguzipodariwof.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/13715232656.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/10841337029.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/63249338886.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/66154184131.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/kulezaminopameralek.pdfIn PDF document text
    • https://phukienbep.net/media/files/62078216701.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ee49779f29259ca7cc6e31b96c51d39b/30139131992.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/mewomixuwe.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/51200678906.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613d14b34e06d---sigozoxitibajewusob.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/74716577619.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/43634605066.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0a10d9e1b95d73e5a97f7d3d5bea970d/74725832940.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/94037959208.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/gudotomiratipug.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/28299519275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cara+transfer+data+iphone+ke+androidPDF 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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 17036 bytes
SHA-256: b53c5c3763ef80ab9e75a32d5e6deacee36a1d4c638cbd60613eb5f5833603da
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 10672 bytes
SHA-256: 0be45b022b9c106ec667b1f250c57fdba1934e6f74493d61a9f5a155196babbc

Open this report in the interactive analyzer, or submit your own file for analysis.