Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c8f1634f263ebd…

MALICIOUS

PDF

87.4 KB Created: 2021-09-03 00:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 15267a36d93a5515533cafcdfae32a71 SHA-1: ed1cbb0e05eb398fef3ebe705bfaa6ed0256d3e9 SHA-256: f2c8f1634f263ebdb8b4e7c463d469f375676d9f351f6084b7d859195798bed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://traktor-tv.de/sites/default/files/file/wijitakujeregusilavisaxif.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca7832a3c---37297348182.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102eef5b0b4c---78360903569.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/30480723665.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/29040946970.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/furekafibafaxali.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021073008424973499.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210826_5A548090DBEACAEA.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/kvu6gqlaj45568ktr8vrqphd65/53709293526.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/40477309611.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f593cbf0a34---vodilaronetugajej.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/643518e35d479dc66191a6d5adfb593a/32292350401.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cafc61303---37324092796.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/dajuzumeroveras.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/52077169214.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/rawifomasezixarafesumewu.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/zujakobaliri.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/66638759799.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16081939404145---34937941546.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ef3f8d9a3c2a7b421f3f0212c59d2e2e/9696429991.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/67377322621.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/k2k8mgi8c7nu6rjbjk72mkc37j/kuwosatogivifevexiperal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cruze+hatchback+manual+for+salePDF 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_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 10932 bytes
SHA-256: 825a29bb7ebdb2d4b2ac4bd0ed691649c69e600fb5995de6469946ff741a4028
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 17864 bytes
SHA-256: 60e7436d448712c7b7a6b3d9d3e405218aebbbfc6b4de8118290448e38c1ce0e
font_02_sfnt_off000137ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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