Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5204df72f1f547…

MALICIOUS

PDF

72.9 KB Created: 2021-09-26 17:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1978aabbfc4df4241e9f2168cacb5791 SHA-1: 90525702fb73e03c1bbcd0630464bfe60ff4f866 SHA-256: ed5204df72f1f547f41ebc541b69a2753ac3dbad5226ee5c4d12ab6bf173f746
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, some hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.hzkontejnery.cz/ckfinder/userfiles/files/xuvimovoribogazeku.pdf
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/72510959515.pdf
    • http://take114.kr/FileData/ckfinder/files/20210913_FE07DD4708D00135.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/c930793415f347ef48eec3ab49bf270a/33831938711.pdf
    • http://boxshop.mn/userfiles/files/noximode.pdf
    • http://mmdplus.com/userfiles/files/20210908_194422.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393ea8ba9a1---52083311772.pdf
    • https://sitarasign.ir/data/file/boluvod.pdf
    • https://98ing.com/upload/ck/files/20210902_192053.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d4ad77b5f0e1433f304bb17321e576f4/munoja.pdf
    • https://nicklason.se/ckfinder/userfiles/files/mapulika.pdf
    • http://selidbe-beograd.info/files/jerofapeso.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/papomozubulenirep.pdf
    • https://pro-biomed.com/admin/userfiles/file/87108075319.pdf
    • https://xn--pssa17sw71b.tw/upimages/files/41490234904.pdf
    • http://studiozoppini.com/userfiles/files/39060091249.pdf
    • http://thamcohoaian.com/webroot/img/files/bupezu.pdf
    • https://mimpiindahsatu.com/contents/files/xoroxejawopaxebezote.pdf
    • http://apnschool.in/singhania/downloads/file/20834008441.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/60568c9dbc8664e84160642735c19feb/rumuvas.pdf
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/66273194333.pdf
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/88059077923.pdf
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/87830134727.pdf
    • http://intelekt.biz/uploads/pages/files/75055076563.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+malware+scanner+test
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b665.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB665 16792 bytes
font_01_sfnt_off0000ce77.bin
8c4a005f76bae68a4bf9d90087db271c6ca6add2ba2fd51af9ba0c2c3a951f24
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE77 18384 bytes
font_02_sfnt_off0000fd68.bin
9ee4e8cf40b2828b89c168e295de5b3479d81c58ee971cb692fef593dc32e41f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 10600 bytes