Malicious PDF — malware analysis report

Static analysis result for SHA-256 4539e785a09d8e88…

MALICIOUS

PDF

93.7 KB Created: 2021-09-03 02:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de2171ebab646daa12f0955d2bdea274 SHA-1: c77ac3b73a9fc60423bee07d06a124e4018f7d41 SHA-256: 4539e785a09d8e8866503e9a2af76ff08b6679117b0927f0e87f660527c2091d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and contains numerous links, many pointing to potentially compromised CMS upload directories. The presence of a link farm suggests an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3397

Heuristics 5

  • 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.
  • 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://urbanconstructions.org/images/uploadedimages/file/83737109829.pdf In PDF document text
    • https://teamcode.net/upload/files/15914767476.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/dizujafebixinudalof.pdfIn PDF document text
    • http://freestyler.cz/img/file/dalowez.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vl7cr9lcbn5cimv7gkmhq641u1/3463169734.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/mekevovogun.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/72425112153.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/24185063812.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/66876134151.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/medezusibijo.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/xoxogerugowufewifekogix.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/57899279936.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/vuzadoroporidulal.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/bozivowofamok.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddac4599f15---50496322891.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/dutosaxilipokeli.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/84758020473.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9deef8e27dc64ad74e38db5ec9e603a9/gutolebumomumotewujig.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075f89d8f5e9---xajeg.pdfIn PDF document text
    • https://designclarf.it/file/85552159537.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/wosejulumamotetudu.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/xobekewuxetalikevofepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dictionary+of+literary+terms+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 17656 bytes
SHA-256: eaed9a4df2fd0f73bd948ab5f72f58a2e006e9bde2f585074849151cdb29d499
font_01_sfnt_off00015163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15163 10980 bytes
SHA-256: d34f5992ce4144fb6f5983b477465155761a59d212396e36ea415f9d2b561ad2

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