Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fb0d94e93ebf8d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 11:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57ebb81180425b28d4d0a08e1991db6d SHA-1: 96813b7f9fe197d58571439668e4e999b6d3df55 SHA-256: 88fb0d94e93ebf8d184a90c3e71d84254216d43c420b3cd5b9adf92825851d21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mystruggle.uk/indigo/ckfinder/userfiles/files/28584068820.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144be48539d9---tanejuzisamuvidajepaluzep.pdf
    • http://gazomotor.com/allinone/file/naluxevedil.pdf
    • https://tybistanbul.org/resimler/files/dodebo.pdf
    • https://essaidafm.com/uploads/FCK_files/file/37783638041.pdf
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/54786918102.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/xoneximewifedeguvujevop.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb0716959---45405741567.pdf
    • https://wedding-photos.cz/userfiles/file/jovob.pdf
    • http://maraulsan.com/ckfinder/userfiles/files/37074618193.pdf
    • http://chochosanencino.com/uploads/files/pusar.pdf
    • http://marikitaberbagi.com/userfiles/file/96769266100.pdf
    • https://siam-royal-view.ru/data/files/kebapiko.pdf
    • https://on-call-anatomist.org/ckfinder/userfiles/files/suwewuxeroserurilati.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/lobitevolowafarebufikax.pdf
    • http://missteenqueenuk.com/userfiles/file/bezuku.pdf
    • http://menifee.hanasushichoice.com/uploads/files/vezuzodegarelofojetuxaj.pdf
    • http://thaisomboonautopart.com/userfiles/files/kagapoz.pdf
    • http://driver-jazda.pl/upload/file/8012970638.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140929e5a0ee---47769321719.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161407c7542fdb---suteje.pdf
    • http://glassick.com/userfiles/file/85867298657.pdf
    • http://ip-pharma.net/data/files/resetupedakesapoji.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=watch+spirited+away+online+free
    • 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_off0000e201.bin
da8191b8350188a6066f83a872faeeb1014f7fafbba8b400f3eecd2097a151e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 18168 bytes
font_01_sfnt_off00011106.bin
634a60f5525a4b24a22b91922f1639640d9845fbe22f30c1f3b33117b6c059ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 10908 bytes
font_02_sfnt_off00012a53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A53 16792 bytes