Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be397652ec89d8e…

MALICIOUS

PDF

144.0 KB Created: 2021-05-17 06:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2028436c2d97a17e0854d9c6144d5a23 SHA-1: 3cab3e951537982d07d280fad6a71cb2e455b860 SHA-256: 6be397652ec89d8e87c9af08c8ff3348c6ff65e88a3314b228fd782661328e8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload locations and other suspicious domains. The presence of embedded URLs and the overall structure suggest it is designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=front+line+defenders+annual+report+2018 PDF link annotation
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a649ea2fe---jugapevoz.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd5d387a4a---2455053951.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/mofosozimotaradolanok.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095bb2cdb652---bozefutezokaxukoxif.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/12788015753.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/1aft2q1k7oomhhpt68sprtf8g2/kozaweluwarotevozirab.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607511a9ae511---8851162058.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780bc259155---podinavuwoxokuve.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/s1tn7rd216mg1rkk99amdk5le5/fanumiwo.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/68b4a85202bd7d175d7e0485cbf4a631/98067569344.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe1504b516---dasipozezesivuka.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609955d6e9436---58149895008.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/bilixikoliwuveguwududeku.pdfIn PDF document text
    • http://allycatering.com/userfiles/jufupewujoze.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a3cce610---xazaxuwovalu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c34cb51109---dumisuno.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/282a460b0bbf258be2e1e3e9ae606ee7/62574152467.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB29 5392 bytes
SHA-256: cd9c6bac2875f732f901c797b27f74896c346d8f6d3377722c644832a3b64a8a
font_01_sfnt_off0001fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD87 11840 bytes
SHA-256: bbf2bb3c4f5371264373b85df15b77008ad3d8f207c9e2bc84f0850b7e326d73
font_02_sfnt_off00022457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22457 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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