Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3423e7caef58e7d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 16:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5484ea0d8a6375e6d292b850a4d668f SHA-1: 785d3c6312eb5dd8ee2e405d52e121d5bf21662d SHA-256: b3423e7caef58e7d35128d754c3bc67160a88a47cc92748d060dd53643e4ffa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and is flagged as a link farm, with several links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://drafthe.ru/uplcv?utm_term=musical+ly+followers PDF link annotation
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2o83s49saggpmm2mg8c2oq8qib/12374801810.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb3df81765---40538246130.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/nafefuxabasameja.pdfIn PDF document text
    • http://drironcat.com/images/file/67613102760.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/39477900.pdfIn PDF document text
    • http://isvpro.com/custom/files/lepugitig.pdfIn PDF document text
    • http://farashimirooz.com/files/621152176.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/23426091887.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/79925577273.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/sasimemowipozitun.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161336d28bfb7a---kemafef.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e1660943a---21169958866.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/susimerovatomidi.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/95306414426.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/batunelitudewotot.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/55204887128.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27f0c8425---81672792935.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/xupujugipivuxiko.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/jofometizo.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b5d51af19f50b46a7cec96aafad944d6/39156955334.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/dioidg0uurhlhldkip4t53sgn2/36706343873.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/dukitezoxezarupigosusim.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a9b127e3---fosemiwoges.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/47481234023.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/76893497015.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_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 17936 bytes
SHA-256: 49ba40dcdc92f780be4ea04d2418e7fc10140f9a82d4bd7647843959dbd81941
font_01_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 10420 bytes
SHA-256: d303a0465dbc8387cff34c505210cb0f21a2fc08949a714571f601b5f86ff7ae