Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce7f89f16a13717…

MALICIOUS

PDF

90.9 KB Created: 2021-06-25 15:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b3280a038d306eb5b37ddada230de5b SHA-1: 3d2cb76dbdb90df8bb6c312d83d9f2896e1cfc12 SHA-256: 4ce7f89f16a13717bf2032210c092971d6b178bf236388d0be68e630c2615175
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting, likely to obscure the final destination and evade detection. The primary attack pattern involves luring users to external sites through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ecovn.vn/uploads/news_file/93828650722.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/048af68bfbed9918433a4d986f252c68/nupofidumuzemufuzinazop.pdf
    • http://cga82.com/admin/File/15334939737.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0e35029157caa33ebb2840d63dc47604/lilokebinasinuwabujatugex.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/83d1c710f9250cf66a9c848f42146307/21883857516.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce9b7bef0---97056438324.pdf
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kidekajaf.pdf
    • http://mesahighclassof63.com/clients/79820/File/nasabimisi.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/54443220428f7f900f04be4bd5870842/3572227600.pdf
    • http://www.hydro-tg.pro/upload/file/48857255712.pdf
    • https://sofupingame.com/calisma2/files/uploads/rebisonafifabolaf.pdf
    • https://vansuloi.com/uploads/userfiles/file/lanewofomar.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=three+letter+word+with+aq
    • 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_off000103a3.bin
b7895ec17936419d92c5cffd650ce69e7ecf180d3cde958374d75d460afbc31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 17224 bytes
font_01_sfnt_off0001305d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1305D 16792 bytes
font_02_sfnt_off00014874.bin
a6b8d3812d82914389458fdf46babc581a056ba77ea38a7fd2c12e85afcad909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14874 10268 bytes

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