Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfe70f6bfcb93d0…

MALICIOUS

PDF

79.2 KB Created: 2021-06-09 18:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f1d0a149f9a660f68613277583bd7a3b SHA-1: 7b5066f96a3b691b5205e6a7c3268c18c2e1bade SHA-256: cbfe70f6bfcb93d0f0b20547d85f5a478e2f6017509b835d98e6dfe18ae8c6b3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document impersonates Netflix to lure users into clicking a link, likely for credential phishing. Several heuristics point to the document being a link farm hosted on compromised or disposable domains, further supporting the phishing and credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://synerhu.ru/uplcv?utm_term=heroes+rising+full+movie+english+dub+online+free.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=heroes+rising+full+movie+english+dub+online+free PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f382e7e94---kukanigitipi.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/lilotaku.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/5ffc6b25a151aff9908de105661481d1/pesexires.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/3178c15c0439e841968722060dbd3e26/34510271394.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/293e664c3f0f79890b925bc13ca56b6a/kukesosuriz.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/25747328640.pdfIn PDF document text
    • https://keongracun.org/contents//files/15617606854.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b40f213dc2449b9f4357e023807b43d6/kinuwot.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/25e129e32ae1a06a87e9792aae41ce1d/17773171283.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608117bd5f6dd---remefanewukaviwe.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6880b7016605a6d62c158cc55efc3305/pivifimizemaxukesebixoku.pdfIn PDF document text
    • https://aedwea.com/upload/foto/petakobomabo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945892d67e0---28598705327.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/lusogotago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 5272 bytes
SHA-256: c40fb653e388f163a25f965894a258c58a5d5a8ec96ea031d2643791a8ad0273
font_01_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 11840 bytes
SHA-256: a892f80b372a143c9811b8efb8ccc5a989b306f2a3a31fcf065e4a1bb0b09242