Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0de449a79e0046…

MALICIOUS

PDF

97.2 KB Created: 2021-09-08 07:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5e5437e3586a671dc56f915b04013b93 SHA-1: f75bc87725f03fe33c29038857ccbe91ec03638b SHA-256: 5b0de449a79e0046d2b7e89f13d0a06f01409fb9de7cf9fff0df4f58abc20c6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://artlabjo.com/userfiles/file/rumikopurolivofugododa.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff75ccc91---dovejiluduwowimepobi.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/6462527303.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/bekol.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a0f3808a4---pulisalosuluxew.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/13879744314.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/98mhfpntokroso8r0ppnfpm9s5/deredezewukevafemogoxudeb.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/t26qvha75js6k377jh19g1qctj/61247296363.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/63114156390.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/49373611640.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609d56f1a6572---7877631456.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/nagifazugunisudu.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/74037949230.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/84940856181.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/lawixisejafavabogo.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/26848958575.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/47467416136.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbffab895d---88018052228.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ff6c421c---15607390049.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5d6ac606---92920497950.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/47788820720.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ece17c160---laduvupafifopulojugunimuf.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/juwusikikupufivepifojewi.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/felabuvesamaludaxu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/72208640506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=le+bourgeois+gentilhomme+pdf+r%C3%A9sum%C3%A9PDF 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_off000111ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A04 11136 bytes
SHA-256: 7b97f0929b72aaa2708b6663568bcd43e0a005c470347cd0de854faf8354ccaa
font_02_sfnt_off00014303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14303 20060 bytes
SHA-256: 9eee03a037d2514a262458ae215268ad9577ea259cb32ec7d06d032ed1794da1

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