Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8aec2364ac1128…

MALICIOUS

PDF

74.1 KB Created: 2021-08-06 09:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f11115122aaa700518422d2b23887ae SHA-1: 5748f6b46080bccb26bfeccb771e4dcdef75c343 SHA-256: 6e8aec2364ac11287e259a4f65ac022c87cc380c2fbf9458c8ae4f20fb987f32
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/kf280ui7v46s18mcj6cr2in028/zagilimajafogabodo.pdf In PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/cb58f3c62535d612ccf019063c814ea0/riwirabinunasupi.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/48609128389.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/jojegeraza.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/momeduzujupete.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/78416362645.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/8skagq3trhmps74h3t1d9uc826/gedisujupikana.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608572e6c1c5d---73415718932.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/97957070462.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/i4k2tc1e3ea43q83aj9ms2ffa8/nowafoxewimiwatax.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba21166d17d---kugixelenip.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/95500716191.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/misiwogofug.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/37560142803.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202107021944.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rigapakip.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/fru6d6o4bn1g725gu9daujcdma/26232487230.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/pivomov.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/gitolipututotimez.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/s2pu162fpld3t62iso8qnfs1u4/16943514725.pdfIn PDF document text
    • http://berbun.com/user_img/file/tagil.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/bubisifiwuzuvex.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/xurenatu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7154909ac---19416121006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=strategic+management+and+competitive+advantage+barneyPDF 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_off0000bbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD9 17352 bytes
SHA-256: dcee5004035fd9a283bfa88df2dc8f3898627e258e412b4686fdcfbae968dc35
font_01_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 11040 bytes
SHA-256: 43c5d65f35bb5ec9521bd9cdf64952b09e7c0020940e29cd3e622ea02c6161f4
font_02_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1