Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d9f5853742b1d9…

MALICIOUS

PDF

87.5 KB Created: 2021-07-20 13:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1afff2f2dfa2b66aab7ff9639b2dbb3d SHA-1: 7411df0c30b8ff9643ac1347015fac1ccc35a980 SHA-256: 85d9f5853742b1d92f8937ff1f87fd9dbd9d22df88fde28ddf30f77b76c964a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e6b1385e---muxezeji.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4faec9f54f---84333610635.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/ffa8f41aebc9775c542d37264a7ed098/nakagali.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6faee4256d893f903652d059ac3721e8/pekevikelosibux.pdfIn PDF document text
    • http://msiutilities.biz/documents/71954719031.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081ab63d4b33---nepevefupekuvufu.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/36350281435.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/0f14a79589b203a64cf68c38fed1907f/nifoginof.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608251a8b54e9---86156752987.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/59548016915.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/1661355165.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/76738536508.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/39986723226.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/15888699845.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/lejifilazuxuzarozo.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///55535267652.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/wizikatifaxilarafuf.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/vogaluwu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/84b7d14e859108af31c4b28eb75a523f/45721316742.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/h8n2os8jt9spmh4gg7ji9jm1li/labepo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4l7nubqi1occpls11h42o96upr/sedozanasifiwiveluwanup.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/18934518908.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/pebipanikogiva.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47a2727006---67552707167.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/5bd1345e931e9293bdcbb5204ff68dd8/37612105948.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e45c1a4cc74---sufewop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=equations+for+satPDF 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_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 18036 bytes
SHA-256: 5b925e30d303d30a76c01cd300939baee6d0f0a5606c6d2142e225b3cacc3834
font_01_sfnt_off000121d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EA 10256 bytes
SHA-256: df94b5094d6899d21c339221206ef393049b09b501ad2d2c33f069d22daaed1b