Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f35b47afe36637c…

MALICIOUS

PDF

95.9 KB Created: 2021-08-29 12:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8950a3e9b5a22163b4b42579c12779fd SHA-1: 0e22f05f865ab520abc22aac4b1bbca454470642 SHA-256: 3f35b47afe36637cafc2779aa128c8d4c985b3ca751f2c575394ff95e2f8d02e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The PDF structure and link farm characteristics point towards a tactic of overwhelming the user with links, potentially to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://smidgel.ru/uplcv?utm_term=humility+personified+meaning PDF link annotation
    • https://listapp.in/ci/userfiles/files/8955200895.pdfIn PDF document text
    • http://ipublicity.cz/data/file/90624295001.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe91a11e2d---pijeterefotideberelexene.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/70061192573.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d44c3b64331---15802374283.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/nizop.pdfIn PDF document text
    • http://gibisch.org/files/files/78781244798.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/30493263319.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4087c90828fee3ff282c784d4adb6975/940753733.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/9rcr1ireqngvvs2g8maoeq8ij5/tufowozazi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a68ec974b8---53305139373.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/426000e0bc499168b9b92c01d8ac4d00/jinejoto.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/54520841752.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/fudov.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/86728953616.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/3626304430.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1235c6b41---44322389216.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/4378574002.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9189342b4f---32408475887.pdfIn PDF document text
    • http://artospace.com/pics/file/31704441735.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/kurepoginunogifisikuguda.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/73507e9a26d2cfdfb5bd06b4241c505c/89945241675.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/68161154811.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_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 20792 bytes
SHA-256: 473e4d2d40ab007c2942da3452f8c73e4493701b25083c6d004cd8bc44fd9113
font_01_sfnt_off00013ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001580c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1580C 11044 bytes
SHA-256: 5dbe6ce420d893046322045ee3b3fa3755eaebd9b177f2db0ed341a6705da71e

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