Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba94a540461f581c…

MALICIOUS

PDF

92.0 KB Created: 2021-07-21 01:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b314a2274e6a73f7d78a6ddd460738b8 SHA-1: 2ba5cbe66bd026e2f1b04e883a10e0f8f4c6263f SHA-256: ba94a540461f581c4bf4064c04e15b752d055b2c0b685ef4da3f2673bbd7fb74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. While no scripts were directly extracted, the PDF structure and URL patterns suggest an intent to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://solidpractise.com/files/userfiles/file/dusadedis.pdf In PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d76e87de5a---porexexoligabafipi.pdfIn PDF document text
    • http://www.77ice.com/upload/files/79930113850.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160903d8cec5d0---kinobi.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/lomapimanuxivewad.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/i9d0sn7tdan6eneif7t7jofhs4/bazogobazesav.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9eb093218ce3b401bfd34796d584b72f/kalezepa.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4d15a696---24546998569.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d91b3583a34---45421093237.pdfIn PDF document text
    • http://vtaky.sk/media/file/mejonepozubotigutexide.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d71e066e6---koxumamunufatopimet.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051415028_809402314.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4273274c55c864ec184049feef2db52/86048177653.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/52067851357.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a322f826a0---47249093701.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/pifunoluv.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160cda8ae617a9---rapusofurerivilimedobo.pdfIn PDF document text
    • https://fallsplat.se/file/46853167731.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210719_5A38D2736D658331.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747f5ed4931---nomabigevuwivevugibe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75624b2051---25654248712.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/vudawivulododasolesijezu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd66b5ac2---lumuwix.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a60d5582cd5---noreguvozajobelaxukod.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/kologudomosukilevaziva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+join+friends+in+stardew+valleyPDF 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_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 17640 bytes
SHA-256: 21fac2936e941d8ad8b71bac96b46e7864ae5e6b147fdc029458991b23137907
font_01_sfnt_off000131ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C4 10736 bytes
SHA-256: e07bfd484baa233b39035f0208c42a386243e949dd74abdddae8ee8f552e6414