Malicious PDF — malware analysis report

Static analysis result for SHA-256 088b1708ac3d70bf…

MALICIOUS

PDF

69.9 KB Created: 2021-09-12 09:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a275aeda8c72384bcec44c1212d0c68e SHA-1: 16071dc4d34cc589a5e0e6f47ca2266a00330ad3 SHA-256: 088b1708ac3d70bf462026fb6d08abf235597a91b89dd521a62417e19141a4e1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of multiple links pointing to potentially compromised or disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, suggests a phishing or malware distribution campaign. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8021

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://investin-khj.ir/ckfinder/userfiles/files/fiwuparajudidaxu.pdf In PDF document text
    • https://gfwofficial.com/ck_imgs/files/mokunaxadijasoretoxetem.pdfIn PDF document text
    • http://husplaza.hu/editor_up/fofovavatudope.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/kezobafaxep.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/51115169218.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/cfd9ff6d6b8d393010a06af26eed20c0/refofifibovosazofodekigu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/likifutirolozagefu.pdfIn PDF document text
    • http://beta-rc.com/upload/files/genutafopowotobojigapuwed.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/80101870300.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109070459533594.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322163ced2c---doresexonutovomebi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d2d5f3259---dasaliminim.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613748dd76859---tisaguzofujas.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210901060528800.pdfIn PDF document text
    • http://spbi.cz/res/file/37249710930.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86735101485.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/mapatimifogukesekabiwexa.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/57394670896.pdfIn PDF document text
    • http://drtamerturan.com/file/30250006225.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/ribiribi.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/2318186869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=lightroom+6+serialPDF 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_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 21172 bytes
SHA-256: d202983c977d1a9a5bfc61f753c5f4b139f7e9f4e5775520769a7a8b69b9c8e8

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