Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cea237b3388efa…

MALICIOUS

PDF

85.0 KB Created: 2021-08-15 20:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7239ab3106406dc51963230c516b9fd8 SHA-1: 1b52b1ee9754f3e9e7feeb36d24b365f68888d90 SHA-256: 13cea237b3388efa9db66a5b3b207a027ebafd2153e835cbbe8f2f4bec03537d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of `utm_term` parameters in some URLs suggests an attempt at SEO manipulation or tracking. The primary attack pattern observed is the distribution of malicious links, likely leading to phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=ejemplos+del+movimiento+rectilineo+uniformemente+acelerado PDF link annotation
    • https://dongcohonda.com/userfiles/file/povovokewane.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a169527760b525d07997864dc0cd387d/xevewapiledupatoso.pdfIn PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/97320886937.pdfIn PDF document text
    • http://partnercable.hu/files/fetirokapaloran.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb192caf398---gebir.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/90281418281.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/xaworulezezomudasel.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/56072861714.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/t6o13gg3skeaq1idjqlqdvjf97/65709250810.pdfIn PDF document text
    • http://nova-auto.com/upload/begonulexinuf.pdfIn PDF document text
    • https://linardi.ru/files/file/28917122920.pdfIn PDF document text
    • https://cncunse.com/d/files/vogitu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610aeda2bd192---pakif.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/73103636126.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/tunubomefokelidiwon.pdfIn PDF document text
    • http://com123.vn/uploads/file/15175872.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4e9aa3f3---60577648985.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078de4425659---57728815498.pdfIn PDF document text
    • https://yuss.it/file/65734397642.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/72618110260.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/kotakajakaxisovijuvob.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff8502e62---41868565385.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/48950411997.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609823f711785---lasetagega.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_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 17000 bytes
SHA-256: 0c56e6255a5d0ad1e2a9dcab56b677168f5817903ae35f79ad90399f3e8b9a34
font_01_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 11060 bytes
SHA-256: abfe4911a20b34466d8925324c95f7aec1e4f77e60e2c5f028dcdebf9f89d6f2
font_02_sfnt_off00012a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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