Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85057a4b7bc4fbc…

MALICIOUS

PDF

92.6 KB Created: 2021-07-26 02:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15f97b7e01910a30f9da26876de42480 SHA-1: f85d609ca88f084ddf68837b478ea0680be975d7 SHA-256: f85057a4b7bc4fbcc2f5003f47d23a5a95fda0b8df071df9959a93c593b82b56
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ad4f5ef1ed91e87269f9d63c83bee6aa/madadusepegidonoxoter.pdf In PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/dalokusuresinugovudugawus.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/645518b98b1927a11a72553bf5dec975/wivofiraze.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-16/images/files/rawigifokapajefe.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/844486415.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/24802010450.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160783035b66c8---nugoluzawobategez.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083510f220bf---joreluw.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/35274622176.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/khjgfanu29tvp4febvbvj26783/ziduwuxezijusimamegigu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a6bf9e39bf0bd7a9462dc6b8e38f40f7/fizagoxajaweleto.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/92960198285.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/muzojugasulumov.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/wogosusirikururobotuf.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/11508190273.pdfIn PDF document text
    • http://topas.lt/userfiles/file/51327101350.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/f96039b70fd8e75d28dd84063b7cf2bc/93221071015.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/13448120885.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/xubevebugesus.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160936052465b6---zepig.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c4dbd3a4ffa37fb85329951962980504/85120303003.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607329d0aa9c2---48237197975.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/tiruxisobejaxazik.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c7152ed61---69721881459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+the+best+beginner+pianoPDF 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_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 17420 bytes
SHA-256: 1f46b60823240b9d5eaa64bab60d593127823c1ac38155ac0ede08fa74b123ab
font_01_sfnt_off00013258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13258 10616 bytes
SHA-256: e952c84e723aa50b2e7a024c8c60cfcc8fea22280fa280ec53630ea2f39b72d5
font_02_sfnt_off00014a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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