Malicious PDF — malware analysis report

Static analysis result for SHA-256 6687ef5aea365677…

MALICIOUS

PDF

86.4 KB Created: 2021-07-19 20:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 987250c9ab0572fbfba9d03b56ba3a82 SHA-1: af2cb2cdeb6110a5e1637610b62a6d86633f83a8 SHA-256: 6687ef5aea365677afa8b10cdc83022f6e101894a564518a6c18fccf7753dfb6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to leverage compromised infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://artenika.pl/fck/file/zasegikesezan.pdf In PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/e4b2f74ec985d771c94c35b072f6ba6b/99211909387.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0f9828fe187b19fba6d1ac1e4af773eb/55809370505.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e8f12f92---69539780498.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48591e619---xekefedikofusiravusu.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/67fbba49d0d80c4161a7ede146127417/mijefotakizanajevamipaj.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/jejilositawijamutibalen.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/51467062614.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/72070135270.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d20aec30c26---67497972538.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/dowotivafazodajib.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/8714845d2fb622bb25642502d0879309/nagikofasogu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f5a6dfd603025fded23073ea376228ad/26034491758.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/69108565646.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf963f809ee---pusefajakexuvo.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/71012414681.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/36587231146.pdfIn PDF document text
    • http://webbuilders.com/files/file/gedofexaveneguruv.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/12398940994.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e6ae57168---zidowotukejojitenitoz.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/galutuvonitexurori.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608695bddfd43---dimavug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=example+of+ambiguous+grammarPDF 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_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 18504 bytes
SHA-256: 84717a18d3121a230dd0cbccfc04b4ff70c1a33258a6a0b3d2a47a08e6220756
font_01_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 10824 bytes
SHA-256: 420f4df26efaa5207898f199f6e8e5cc78445e1d8e62fccbb297edf8e1081d99
font_02_sfnt_off000134ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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