Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc79761f92d6386…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 11:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4570324c8be34b8019d57af673c2c752 SHA-1: d67fe0d32f04701db7b442d29acfc53322c5633c SHA-256: fbc79761f92d638621ca1fcfedfe1141c8c4a69772f51fb2b6c4c23dd19f56fc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to disposable hosting and compromised CMS upload storage, suggesting an attempt to distribute malicious content or redirect users. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of embedded URLs and link farms points to a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wmc21.com/ckupload/files/jopigulofemi.pdf In PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/liwejesite.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdad12457a---komudanived.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613747e7c2de6---mijijoragowepan.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/12502115866.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/rijekorepot.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/nanebupax.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/muwukexojuwotulifofemoba.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/6822579592.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210902165253.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132d117a744a---60369344524.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/82f02df56af98a4b243480988169e837/gonibapemijovoxonazi.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/83002423983.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/4981948473.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/nagofalukufisamife.pdfIn PDF document text
    • http://quetthe.com/upload/files/44364493870.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/92714557825.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/32423946536.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109121826515195.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/75096692766.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/4160294429.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/baxavawanokugezanazuwuzoj.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/17798821144.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/14441685697.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/tifakolugit.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/golebanozumavivinabuxov.pdfIn PDF document text
    • http://didula.ru/img/file/29457497892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+color+does+pink+and+purple+makePDF 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_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 10964 bytes
SHA-256: c54f2b71040e483997af6c781a1189adb28a58fbcd5696618229f12f7d562f73
font_01_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 18368 bytes
SHA-256: aecc32db48aa3d320676257b30e5ca8d391f850c85691535e260e2d76c5fd6a8
font_02_sfnt_off00012baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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