Malicious PDF — malware analysis report

Static analysis result for SHA-256 785c350e1497f47c…

MALICIOUS

PDF

56.7 KB Created: 2021-09-20 07:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f413fb93f5d570b2633c4bdc2224cbf SHA-1: ed0e506f27cb80f3f0473898824aaf4560d00ee1 SHA-256: 785c350e1497f47c0941f1a0b86b24f8dc9f05d3c6f2a3482d56f5c0b168ca60
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the presence of a link farm on disposable hosting, suggesting an attempt to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7660

Heuristics 5

  • 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
  • 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://yavuzselimvakfi.org/resimler/site/files/jizatisanenusipe.pdf In PDF document text
    • https://mimpiindah88.com/contents/files/rogejelodaxosadosojemupu.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/jiwukixiwakixenizutugow.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/tajisipeluw.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/7034934968.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa4d13db13---migunoninogig.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327ea7e3431---7576500472.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/88949387582.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/94157538227.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/51168903113.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/18489062308.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/89304534898.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/duzumupigogirevojezob.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/93121172741.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210920060646.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/64124975276.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/94514366818.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/61441860330.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/92044961010.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/vifilale.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ecb616f31---9015941429.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/sefuzejafewode.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/43578212370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tablet+clone+appPDF link annotation
    • 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_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 10112 bytes
SHA-256: c7517bb517d1cc199eb48661fccf6dd7dd8de937e65ad510639104bd42231e8c

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