Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10fbc25f03ef8d2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 18:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3aeb305b7a1433fa8dfaf698c345599e SHA-1: 5be6acd153ece3c9829b2fee17eb97c3e94193c8 SHA-256: c10fbc25f03ef8d2892b80e33b01a2f3b428e6efe69ee60856a85a0f92eb1102
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file exhibits characteristics of a phishing lure, as indicated by the 'SE_CALLBACK_LURE' heuristic and the presence of numerous links to potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with attempts to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fajanav.com/aym_image/files/46045921064.pdf In PDF document text
    • http://devison-matras.com/upload/file/lajajemaviraxuvad.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608225276a176---90410981460.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/16120305159.pdfIn PDF document text
    • http://charivne.info/images/file/guzuwuridonojevid.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/vogojebuf.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0603d5f867---dojobozipujomulofuv.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/91978148446.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608253a55fbb4---jivedaribepad.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/f1a83e42a491eaadeba792e59aed6b7a/9649631515.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/af7f3041a5e2aa0b2211368b69649d9c/49602019184.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/12999273812.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b503bcf072---kawezamukisusolosegib.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb0840070e---gebofipi.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jo4pec0omki1nqkq2uo6d07fs3/zipawovisoki.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/sozevexixib.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d67a1aed5f4---zokos.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/xajitegiv.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/jipogukapoxegagapevena.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/sumuxosifapomuj.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/nidiwibo.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/wokezadusobewuwuto.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/99509354915.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160885738d67c2---12856021585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=arima+model+in+time+series+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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 10640 bytes
SHA-256: 11038b9fa6eea62c0941dc6cee20c20853e6438fd6a28b8761732e0c95e418a7
font_01_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 17716 bytes
SHA-256: b73f98b5d83c46e326b0e0bdef0d8a0648e906c534b8a3cf1cd3427a057fd8bc
font_02_sfnt_off000124bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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