Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa1ffff4e4427d7…

MALICIOUS

PDF

90.7 KB Created: 2021-08-20 01:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6aa66d0dc2d019c01ffa723451aa2444 SHA-1: 8188a2ecf34b53875e308cfa369e296ff22235d6 SHA-256: 4fa1ffff4e4427d7e03be2c2f163d5566b0b56d0426710f77b0303748b09d7e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=ccs+c+compiler+free+download+crack PDF link annotation
    • https://xebecdesign.com/xebec/userfiles/file/jukuredutikivugowelirolag.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://tms-operation.com/upload/files/webiletisomisop.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/87499543739.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/26967473759.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/fatugonavudelig.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607761f7227dd---29241158420.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/wobipafeluzusuwegovatuje.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ebad85e72---89929676134.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2eed0d0d214e096626d8e1be19eb8ecd/44123311121.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/64739193678.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/6924230970.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/53893502424.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/padavikidafuwunazewilowu.pdfIn PDF document text
    • http://jp-cable.com/d/files/32602662522.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/66778022457.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4cf66ca08---56581547676.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c593a1e56---torafaki.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/5853385201.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/f2lhm07cquabkeqhonica80lu1/45512643367.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16108843747aa5---musobuluxuzojosejupova.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/lanagujimunerodizaf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 10892 bytes
SHA-256: de60431cd2375bb2b1cc6de865ee36ba16ce874695430cb2461deb1121dc1ad6
font_02_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 19688 bytes
SHA-256: aa805a738ee55b78608fdb04beaefbdd7bf1a3b9a70b4153eaba2639f88eaad1
font_03_sfnt_off000143f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F6 16416 bytes
SHA-256: 0a7c40006fc27d51153b21d6a48ea79a8c7f146cc8b15030b343ea684e52a4c8

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