Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6bd395ab442478…

MALICIOUS

PDF

78.3 KB Created: 2021-08-26 07:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a78cba6ae3f113b5ea2e4f29b046183 SHA-1: 9e06ea9428a990649eb38bf51e32697b821270dd SHA-256: 7a6bd395ab4424784d0431f1d50011fb845564f48cf681204d9a2be270c56a4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4a9dba95---62253400094.pdf In PDF document text
    • http://kapelski.pl/userfiles/file/jopupomegamewabokoxuxirab.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/57500561015.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/budadopitowepe.pdfIn PDF document text
    • http://ahchala.com/img/file/xoropujulipatulirewijo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eecc13797---861190575.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/79342659438.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/59eaa415a1db69ed903f65442a20ad92/97197727493.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091040577310---sutamixepox.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e18093fbbe86b3540ab4bc9f274f51e4/38100832822.pdfIn PDF document text
    • http://servmed.net/userfiles/file/29736681643.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/sunipelunajex.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/70845377593.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6572df394432832d5d6d11d7378f014c/dokut.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/rosikurovexavunivaso.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/b1taboust6k6kaoe2biqfgj5ff/20134236463.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/6361516871.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///2021725131986690.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/xulawesotefobuxefib.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/wuwezuvanafiravif.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/dujifefiboxaluzij.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a18a16b3---duxemoten.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990ea7aaa66---refasozozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=can+i+go+onPDF 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_off0000d0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 9772 bytes
SHA-256: 476f3f5d2c43b9b39225165278faea25427d54237c54df10435c65162e108c04
font_02_sfnt_off0000fe3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 17300 bytes
SHA-256: ae5d020cd547293ae601ffa3222de19afc58ef157e0237258e4604fd275126e9

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