Malicious PDF — malware analysis report

Static analysis result for SHA-256 af36ce4966eb4411…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 04:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbb6215617475dabbcb2d7c9fa653974 SHA-1: 5084c578ee2bbe8f0768c0876ffa31a0cea5d33b SHA-256: af36ce4966eb4411369057e26c6432000ff5fada14ff6d3f850f1092d091be47
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics, along with the 'SE_CALLBACK_LURE' rule, suggests a phishing or scam attempt designed to redirect users to malicious content or solicit information. No scripts were extracted, but the overall structure and URL distribution strongly indicate a malicious intent to deliver a payload or phish users.

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://queure.ru/uplcv?utm_term=cara+download+wetv+di+smart+tv PDF link annotation
    • http://romengo.com/ckfinder/userfiles/files/bugitiludufo.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea7b9449e---34808085472.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/29901463490.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/77002973598.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3fe12c239---sinobagemisusipitipoj.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133673b61cb6---bunamitarilatemow.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/bopux.pdfIn PDF document text
    • https://adikkedua.com/contents/files/lufupunogubekukojisutim.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/purexa.pdfIn PDF document text
    • http://metabolit.ru/files/file/85607137129.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109021358581724.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377e4cb3d24---rexopuwamumisunatomanegap.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/relukujagalekox.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/42281079359.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/97183609416.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/bomesudezolewikujawikeja.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/43993860239.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613668aaa3b9b---vamud.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/70967303002.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/lavezexev.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/jozosukukulagenevi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/35984543998.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/43521367007.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/8321525000.pdfIn PDF document text
    • 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_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 18356 bytes
SHA-256: fdd3f91bf9c5483fecd230738bc783b9c8e8fd8093a849b79bbea315a3cf2202
font_01_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 10592 bytes
SHA-256: 3bab2d80944aa4e0285829a9c62f5bb887dd9f7832e0f22a25c88c1bd179bef6

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