Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79f6bf066a8ac44…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 12:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89e03eb5052d4b3f14d39306b6a3b304 SHA-1: d13f6f93696af36de89489760d6dd5bff5bfac8d SHA-256: b79f6bf066a8ac444cfce4c3db8247e372e2430f260c6f7e0e24ee3ad480edce
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://etalentlink.com/uploadfile/file///2021091910213686.pdf In PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/guvufom.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/81168818648.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/vafakusosi.pdfIn PDF document text
    • http://sadrokartonyhk.cz/images/fckfiles/file/47308076924.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/sutujibexaxonanobawo.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/95700040894.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/xetakoganowafejufi.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/pojunurozorel.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/96273925245.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/buvabigixodonef.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/28271323070.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/jejasotevizugedubonujabom.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/87bec2018ca977a413bd173419474af6/79855592651.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/ganukutokuleluwas.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/kesiwimisugojes.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8c005149---salunezuvu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6e5b0db7259708579ec05cae803d281c/98863202965.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202196827299475.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/wakixatojovog.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/39682280482.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/nininan.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/diwetasaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mortal+kombat+2021+free+full+moviePDF 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_off0000ae96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AD 10788 bytes
SHA-256: dace3eb64e073bb0ce548b88a2b6500526136c644b1738fb9baf7831eee73662
font_02_sfnt_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 16288 bytes
SHA-256: c2ed377e4dec6d2412476d14b654ff24d554d64c59eddf36ab94a01b3a19750e