Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c425bba32eff99…

MALICIOUS

PDF

87.9 KB Created: 2021-08-13 12:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a656121c9e75bd795d2b1f3e6acb761e SHA-1: f3536fd79122ab909c65a09f5ea62ba2a91a1421 SHA-256: d5c425bba32eff99d6ee05cf903d173f92e112a299934de4f18e839af89385cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 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://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bafe3f009---78763801195.pdf In PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e165b9cfd475eeb116f0f6ed37cc8af9/36096825272.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5233439278a8d77fc3594cd12cfd7fab/juvaxajorosaxixeso.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/vevuj.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607346f8d7662---8525218664.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/cdaf8809edeb84bb40a38111b31d0394/24159001780.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b242ea04f---79989060079.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/73953753777.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/8d7098f6251f54c49ceabb1f25f97d8d/58793023746.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/031017172743673e4298a220593d4b57/63000940131.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/gimijozo.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/98579537368982f6eb3f683f4c2c1715/kiwirubeb.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947a7cd91b8---gojijefagifas.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/29044290776.pdfIn PDF document text
    • https://coluer.ir/documents/file/4955496580.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac7d7f378---tinukituwokafo.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/55146423976.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/dawufigerolowonefododavon.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a56f1b57f86---57056286766.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf9bb3c768---18385225570.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/06/file/vepekunatiwevagesudolad.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a228e17d7daa0ec4c87c24c29067ce48/runoburipuzokejopivujub.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081d044ea817---93423791659.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/14492881946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=como+fazer+identidade+falsa+perfeitaPDF 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_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 20428 bytes
SHA-256: b7ba1f96673ff0f36b1a8a29d46fa96e6e0c568dff15d285ccbab9d62a225a35
font_02_sfnt_off00013777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13777 10748 bytes
SHA-256: 8847658125ea229d5c30dbb1f5969b6679482e7cd0af44236788f051ed7f80ba