Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a0e4bcbeaa0b21…

MALICIOUS

PDF

82.9 KB Created: 2021-08-16 05:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: baf101c10d651fc7e1cc49d50d604b98 SHA-1: 4852cdf67b07e17fe80df03f163996b1d9f08abc SHA-256: 86a0e4bcbeaa0b21930410b13d1d90ae11312289267677fe7ab44beef83dc295
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=biblical+names+and+their+meanings+pdf PDF link annotation
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16119c01f000d2---kerotarujeluxo.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/levebapefudasowovunejej.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/e3f0d81e2f5eeabefcc4ca4078221a5e/8808074449.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18847909f---jiruliror.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/68629407199.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/48b7eee157f58feababaefb91d5bf383/tebunu.pdfIn PDF document text
    • https://isleo.com/i_photos/file/bojefagiwa.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c522ce7889f---fizegejugudev.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/fexofedotawaduxojuwikolod.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/44799527785.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/2c52e4072fb08c68a3e18424f9300659/97965160659.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/15957518498.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/dunuwipulol.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94548e3d8---81671724887.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/linekimuja.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/dajix.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/5280954081.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1953feeikp27agus8s0lbojg5e/zedapizigeg.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/73619637882.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/9g2jpdbpuafh91naee3a15g6b9/94100730692.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/fufoj.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/xuvuxuzuzotapama.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/fuluragipiwizulif.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/29101570285.pdfIn PDF document text
    • 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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 11140 bytes
SHA-256: 251ce25aefbcf7e673e86e46a4ee858b399398aff2395728a31d401830b124b8
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 17196 bytes
SHA-256: feafe7faa6a823265574b17bf230322ae1d37cc3166996bd701267cd6dc3abb0

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