Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee85134a5b1cc21f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 05:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c22be182afac77db9248b595b608d7bc SHA-1: 5b63e44d1cd00ca7c17f4ed84bce29a5e7518a57 SHA-256: ee85134a5b1cc21f7a52059b44d1fd2853442cc0e48c16a282755867245768cd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=vector+calculus+6th+edition+pdf PDF link annotation
    • http://comp-art.ru/userfiles/file/91032257202.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/fudewubujo.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/tetozizazi.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/woriguk.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/53832426115.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/2486493247.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/65729742162.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1329ae0744f02d7bc3ea5005a6f0c4e7/lefowuxi.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/28110460169.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f192ca480---zudubuzakopep.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/mozonepe.pdfIn PDF document text
    • https://lazerom.pro/media/file/10743935408.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/71013013091.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/dekanimuxiwam.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/56567259397.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/buwuwugukaratazesupuzu.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/85774304656.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f93fbda17042c2786b30cbe89b05c119/nubazubekogotiradiniweru.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/suxerikosesipipixogilane.pdfIn PDF document text
    • http://vit-physio.de/file/32830538254.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf98ac61c---27766071495.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7464b2c78214e491bcc2bb3a617fa1da/lozagageruxeximegalusewop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 17932 bytes
SHA-256: e9cf211414be64fd407ef7f9f1922f32ec6e1fbe4af1431bf7fe875b10ab74bb
font_01_sfnt_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001148a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 10952 bytes
SHA-256: 7b01393b61ea76c63acd6f0b85f79377d7679c4b26841af92d425b0ac247fede

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