Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e733c752c630a1…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 16:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 348377d09a264ed78fa09164c7fa3f70 SHA-1: cdfcb252dedfe5fe5dd0bba653bfa7024182ad8a SHA-256: a7e733c752c630a12b1aa399311d8f9493d68c962e01b44e22de299ba7a94a2d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content through these links.

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 http://adamlegal.com/userfiles/file/36750600901.pdf In PDF document text
    • http://itps-group.com/uploadfiles/file/26925321547.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/64170197178.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/bupiboxujenedavikoxur.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e086faf852---81703019754.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/19818242568.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/beduwivuvuzipamaz.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0e799b44eae7d13a5debb94124e6a044/fapazokakavolofaxewubu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8a8f3bd1144d54f90874f509704f6a3f/94942697787.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/wakarogomozara.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/6249355087.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8ea94b485---sapotenekomujamumakugozew.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/f93482befd077148352234f2a1151ff4/petekezolavidixep.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/25032636213.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/kimuwogomovurabofakep.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/16qpuqst3gaqvte4lqkoq0lt72/xoxixekejirowosojileka.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/30816265934.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/fadefiw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/rosesozix.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609facaf094a3---xefugegidutiwaxusapola.pdfIn PDF document text
    • https://virker-ikke.dk/files/sobewoxoxebifaxopuwadilaz.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/jn7v9arh8434l4vnbtjjsp4knf/josopamolejodet.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607895b5119ca---lotizagidetafukodaritun.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a1e0466375a5b460c2041258d1c76817/nefimaguwiguge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=rakesh+yadav+7300+maths+book+pdfPDF 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_off0000bc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0E 17260 bytes
SHA-256: 563b5841c23629cc126f2381dc8a0ffeb21c13bd3b79798f2d531364edc52689
font_01_sfnt_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 11224 bytes
SHA-256: 6c3c508246d277142911d6c9298133a6960c14a8ba8738c22d6a4c0b8f001c67
font_02_sfnt_off0001027c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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