Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3f8c8a256c4d9e…

MALICIOUS

PDF

94.7 KB Created: 2021-07-02 19:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 080e8297b1d8a8a9a68e08851e834d9f SHA-1: 22e8302d0caab96a01d9a4216866ed99a8d58c34 SHA-256: 7b3f8c8a256c4d9e4c079a790042dc5b3bb544f2f4abfa200e7531aa1e5e2850
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs indicate an attempt to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=what+ended+reconstruction+in+1877 PDF link annotation
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/4381uqls2dqt690c0m5nq1vj73/naxebofivuzijodofovufidu.pdfIn PDF document text
    • http://cocoal.com/uploads/file/71693972327.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/16ea48b2c72a577eb60beab6282e790e/6061218566.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/fatadosawil.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dfc04c2f4---25863224653.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/jijokuviziwupiwej.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/69388978030.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87efbe24a7---sisam.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/jusodugabawuz.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210508174745_830715060.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/c7c8ef2295f12707f772ecfc5bdc6284/10199375907.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/16918944686.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e451b064b91fa21a94df0ab7bb96a070/34242083298.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a10d91677aa1e5925023ddb091fe038f/zotefajofodami.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/xerumoke.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/19260464799.pdfIn PDF document text
    • http://candientushinko.com/images/file/76188511333.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/05a6q7670k4brapptko9tpphpk/fovebi.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/xugoramexa.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/0dce903734844d1e31db1053b85bc32f/48098290885.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/15056316428.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c6a777825821f6c7e9d8e433fefc79d5/25307004862.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_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 16316 bytes
SHA-256: 12d2ad92ad0778d19430d6b49ba387f9d88386f8da42d71a6379d20ed2da7d55
font_01_sfnt_off00013ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D0 10824 bytes
SHA-256: 5f6ed71b79a81a8f325ecf9ef647e0c9bc682f32ea317bdfa37b0a2f90445b33

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