Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc3f8ca862cd842…

MALICIOUS

PDF

85.8 KB Created: 2021-07-20 07:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbbccbd646d3b0910199963c7b4001fc SHA-1: 5817cb5e119847832238dc50dd5d76282532d91d SHA-256: 8fc3f8ca862cd8420fcd7fd69a085ce2622fad011084653c7b598e7c282de89f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/32be636d5bcfb43b46693a906927717a/71518407169.pdf
    • https://liderpin.com/calisma2/files/uploads/48657169108.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bubutem.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/gifagifugekad.pdf
    • https://bataretak.com/img/files/file/lukejub.pdf
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/65357823098.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160797800aac29---jijebesixaduvirisijurozi.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a1b50335a223f54d2c6e1648e6e43526/1877560239.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6384e4b120007a09cddfcd9ee1e8844d/zifafajumibajejopewup.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ausbpr7vv8i5fpbvn7fclu7lp4/juvaxawofugokit.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/083f08221e9ea32b7205f3c8c89a5084/pawuviw.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073af539f926---vetobeku.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/e0a3pr0lbpsof9rtm45u85rvic/64724626313.pdf
    • http://union.travel/ckfinder/userfiles/files/90990610524.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078414f438a3---xaxosuwemekaluvumuzovofu.pdf
    • http://sosnovgeo.ru/userfiles/file/lifaguz.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/xibokolobakibikajiginuku.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qhpghs9vqbuodvfarjs7psh6p3/tewawozazexop.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c949589384---kolabapazovidi.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160941da772051---labevesafewujepijopamubis.pdf
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/4386396352.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ascending+reticular+activating+system
    • 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_off0000e98d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 16792 bytes
font_01_sfnt_off000101a4.bin
37b3dbbcc3fb0c4308195589fcc25f16f3d593d8226a44c790968bd9854b43d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 10856 bytes
font_02_sfnt_off00011a8a.bin
363c436f772c0eff427e5d5bdde9c6ea6e66e2e168589a6dc9b6d18033f95e15
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 18300 bytes