Malicious PDF — malware analysis report

Static analysis result for SHA-256 117cb166296f532a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 09:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81fa6367a7c00b36f7117501b794b22f SHA-1: 6a7caa3f4235119c43a28ac6a3e4c9719b47f280 SHA-256: 117cb166296f532a1275d02c77651e55be24e5260cdf930bd390e96b9ebe975a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4067cc936937734adbbd5277e300cf69/9518867421.pdf
    • https://spiuruguay.com/ckfinder/userfiles/files/titubotuninefuda.pdf
    • https://clifestyle.net/uploades/userfiles/file/97035892404.pdf
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/ti2jrlp63pfd9jagpvg7jp94qn/sotivipinuxevowibulexake.pdf
    • https://fl-forever.com/upfiles/editor/files/ziwebib.pdf
    • https://0900107678.com/upload/file/funaxom.pdf
    • http://yaeram.com/userData/board/file/wuxitavosu.pdf
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bolofizelozexezipez.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/kugosemilisifaji.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/11af55c83960260170860b68a163dc2d/63859576925.pdf
    • http://kaithompson.com/userfiles/file/12562002182.pdf
    • http://driver-jazda.pl/upload/file/ziwetolubama.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e142fe78e4c---73689596215.pdf
    • http://gabinetortodontyczny.eu/userfiles/file/38608070524.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/60414121460.pdf
    • http://geyikkimya.com/userfiles/upload/file/xuxexutorokefaji.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/9e1ec37e51ccd3a47f9ddfc35003a3c6/82426680459.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ogh47o6ivgihkqdieorc2n2tir/69191353875.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a8686b864---74968921954.pdf
    • http://dges.in/userfiles/file/25924276430.pdf
    • http://tostonet.cl/ckfinder/userfiles/files/sokukudigexalolob.pdf
    • http://wmsone.com/eimages/file/lexazamuwo.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/5chffmabla87bgtn4ls6v3ffbn/xulux.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=table+napkin+folding+steps+pdf
    • 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_off0000e33f.bin
a1a2a890fe6bc62197376dd9a62b8f741ed516dd4adefd77b5b852fc06708c58
pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 17468 bytes
font_01_sfnt_off000110b2.bin
a3bb12009c8f201f5237256a7404d8f9ed7219a1c791a64df2f7d1e767fc8dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 10768 bytes
font_02_sfnt_off00012930.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12930 16792 bytes