Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c8d2f91dafd3e6…

MALICIOUS

PDF

78.7 KB Created: 2021-06-14 11:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 281d58d68d9237b553fd89d027d5a419 SHA-1: 9c388a2d0c8a9f59568e5c628bbfffdfd0a80d3e SHA-256: 48c8d2f91dafd3e69441fae5506e67f2806341d14249559107bbc041a9f96ace
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=mhw+augmentation+iceborne PDF link annotation
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a28226ecd3---7116847927.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e5956b100753de898eb240760c12cc18/gowaz.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/75ce6332317fd4cdcc3e55b004c1b30c/radubuzo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75f6d637ca---96289488133.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9f5d60b3eea5ea22bd207eba3ede2570/gifipenikaganozezojarawe.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/faxaxezeriri.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/busojiw.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85c11993c---pebusepejojivozisorevup.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/sozinebobopotix.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63dfe64bd0---nigag.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3rqo26nog25369ac9v5rvv2l30/48324453288.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/eua0e0oob6vkade41rn81j2850/40718788024.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/dubigudanumetabisuxenufux.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9048c3738---48273055371.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6ec24aec7df1ff6b8e0320c3ca862c5e/99729977934.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/148aos867schae8lg4l5egrnjb/40997352510.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/17581407220.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4ead9115d---64995709308.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e937eac405105ccd8e2069959ffc15ad/kabuditesok.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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 5120 bytes
SHA-256: 6017c866dc927b2b0aa15e4b4a697877edae3dc3476b5e8f72dabb7c991315d0
font_01_sfnt_off0000f953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 11148 bytes
SHA-256: 9ed2c786697233599d9a7c7cc357f7348b36a20a3e0c1e4676e080451c123c6f
font_02_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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