Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ef5ab0e728a5a1…

MALICIOUS

PDF

98.2 KB Created: 2021-09-17 04:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90ce078466a5a74c87574c3040f1f913 SHA-1: 91beb1f14b28ef937159aa864a2d1ba28bd9f96c SHA-256: 12ef5ab0e728a5a1d02b91b13e8a55e558050c86c2894494caa0f68073fc14d5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=warhammer+40k+ebooks+free+download PDF link annotation
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0dd4b3de9---bonarapo.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/jelitadug.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/vurifilol.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/kanisatanexobulesofukevof.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/83463624523.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/738b94148544257cde37ce09b4a3f247/60384862559.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/bumane.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1eee6350e5a31bfb7238a92a91ca62f0/69635762001.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/68194017590.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/ruzimimonusi.pdfIn PDF document text
    • http://metallpress.info/files/6995917159.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/70319783606.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/roxusuzu.pdfIn PDF document text
    • http://novafish.it/userfiles/files/gabubefomowigixo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hcb9ueatnerr3td70ahic5poga/39463293554.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210916095138.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/77372824809.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/35003143088.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/69754735989.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/ditopelabaxexiludava.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/paxomivel.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/87683563455.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/pipeginog.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5517ed4175444a33db242651ed81b960/gowifo.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/pudajijujodawi.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_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001315c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315C 10940 bytes
SHA-256: 1c49085ae898c2d0629320fafa4e06624af764034885845fb31985aaf0d0893a
font_02_sfnt_off00014a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A95 18824 bytes
SHA-256: ad60b48001ce3a80042c66426f12ed0d752eb7b7406f8ccbf2890340feff6b03

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