Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d95db80825e9af…

MALICIOUS

PDF

88.3 KB Created: 2021-09-02 02:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c20c024e1741257e990d27ecb3bd2942 SHA-1: de6a5d02685d98a10a1118f479c6971aade05264 SHA-256: 55d95db80825e9af32d3e5a967cfeefcdeb8c795872741d778fe293ee8ddd5f0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external websites. Several heuristics indicate that these links are part of a link farm, with some hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://karinbentum.nl/uploads/file/15285686706.pdf In PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/dudodawaxexetezofoseka.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/fd2e4bc8a48e4b86eb697076961a9a74/38072880287.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/gifoxuxujologor.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d155693a80bea4862c75ecb8eb069bc1/68968406211.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202108242303335932.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd0a6d8b1---76131629272.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c415c1df38bf7b9433bc64a8897c2a9b/wemubejikipokowukezug.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/35988436307.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16098f5ae17790---xatagujagoto.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/radegegubemirevisawoku.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/300443167487.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/xumoxosowupamanaf.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/o9819pqqosm6cjiejb4pblu5mm/jawofeniwudebuvov.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/5600133534.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/95539930371.pdfIn PDF document text
    • https://synersys.fr/contenu/file/jezulok.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/558146878.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/vajeteziso.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/xesafokelipe.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/wadumutebim.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a175de0951c---35144193113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+odyssey+book+11+quotesPDF 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_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 10448 bytes
SHA-256: ca47f2f2b28a5398b5b6e47879ec102ac0193bb226722b771fdff91868f7070c
font_01_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 18052 bytes
SHA-256: 3210b09c8c63d921f70283ed1858133aba19c6dddb1899231756f943600f4af7
font_02_sfnt_off00013ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.