Malicious PDF — malware analysis report

Static analysis result for SHA-256 af86452f545f5ffe…

MALICIOUS

PDF

64.0 KB Created: 2021-09-23 16:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3dff0a63ed586379afcaa1a4468d1d5 SHA-1: 2c50902ba00846e8ee616e68711a79d39813a2ef SHA-256: af86452f545f5ffe90d77a0ae7c15b7ba7b10e4a7fb00dd06d3a5fd2842daa2d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of a raw IP address in one of the URIs and the ML classifier's high confidence score suggest malicious intent. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613426931d3bb---laguzusaj.pdf In PDF document text
    • http://donghobaoan.com/uploads/files/84381411948.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/70058526181.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/20215093716.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/supowabamupaneziwuvatol.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/48265583931.pdfIn PDF document text
    • http://portableandcool.com/files/files/9130304180.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210918_7CB7E3ADADDFA2DA.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/kapituvuwukurogoxemedo.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/77036020249.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/32371269639.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e95b2d42ef---kasinefater.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/lagawujepunibavipi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613b473dd7ff3---84151137970.pdfPDF link annotation
    • http://energo-winstal.pl/userfiles/file/kuzijewisupezawade.pdfIn PDF document text
    • https://lorus.rs/files/59348580204.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/94936767561.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/c180c087cba6be60258628b876f7136c/sirorowidi.pdfIn PDF document text
    • https://izometal.net/mm/file/14699035605.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/33781751538.pdfIn PDF document text
    • https://scalper.ir/data/files/file/zinanomaluw.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210913_001228.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/5578114563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=actualizar+samsung+gt+s5360PDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/37211301243.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 11056 bytes
SHA-256: e2d4a1e5b1e89bb67a7dd1fe66d95bf13285769db9a2802e77a60721390fb279

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