Malicious PDF — malware analysis report

Static analysis result for SHA-256 973e9481f7db6ab3…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 20:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5609eda51097352ed487ff13836485c SHA-1: c81fa6f5658ab0a05b031d862042c54f5ee8af3d SHA-256: 973e9481f7db6ab3c37e511e1337b5062a1ebc7f73c67cab09cd9a0fbb278512
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://newegys.egyseg.eu/ckfinder/userfiles/files/53114327092.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b429a38a0e---nujukezeworokokof.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9198b43ca---xivazogiguwopovupuparakuz.pdf
    • https://sharjahcements.com/images/bulk_images/files/82599268091.pdf
    • http://kco.su/userfiles/file/koxelajizuk.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6f0ade07f79151d407157404dd083520/90924242912.pdf
    • http://abwferrellpkwy.com/uploads/files/zejikesuwoxoturonizipi.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4320c7976---95720853245.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d887d10190cce06e9cd66c83a248e50f/4814712683.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/du9kfdrr7osn6ghqmge6he33h4/numutigasuto.pdf
    • http://shengyaweb.com/uploadfile/file/2021072702384673.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/10135254931.pdf
    • http://azseal.net/uploads/userfiles/file/vukifutadupefusevotajesuj.pdf
    • http://castrolmintabolt.hu/images/upload/file/55971579797.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b681ead1a5---134714974.pdf
    • http://skyparadisecoffin.com/images/media/files/gonexazefelovu.pdf
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/84295731988.pdf
    • http://www.gesas.it/media/mailinglist/file/75375349540.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af58c228c88---golojine.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/zogivolikiseponojin.pdf
    • http://rgn2u.com/userfiles/files/92803101601.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/276e2c7c4cd39dd4003de9e777508fb7/lolujarepekefolo.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/kmvi3ipan06agp4ncma7dtta5f/zilagediwa.pdf
    • http://mav-auto.ru/images/file/97014170342.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/zidejogugasil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=options+futures+and+other+derivatives+pdf+download
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1c450ed075c7d31d88ec8288ed78706b/zesifofezisokopo.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_off0000dca8.bin
d6bb34657d6c8f44f0c8fb0881ea97a77741a73f22d511faa2505d11d1c59322
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 10872 bytes
font_01_sfnt_off0000f5d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16792 bytes
font_02_sfnt_off00010de2.bin
bdc56900db4bcf011debe3db91e1438551c8ea35608376e3b7e439deb1caf2a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE2 19912 bytes