Malicious PDF — malware analysis report

Static analysis result for SHA-256 a841a5635a6e3d6e…

MALICIOUS

PDF

91.5 KB Created: 2021-09-08 03:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 602029a1d92c6693588de6f19c74c056 SHA-1: 686931770374235d78e17039ca8a8a8c912b5d3c SHA-256: a841a5635a6e3d6ef31e09aaa9743913ceb11097620961f767cdd6a3024da3d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609489c01cad7---91384826475.pdf In PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/kerogekux.pdfIn PDF document text
    • http://qwerty.pl/_data/file/9377436194.pdfIn PDF document text
    • http://aps-mes.com/files/file/23906396286.pdfIn PDF document text
    • https://robodom.si/files_vsebine/76237842884.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/95094813695.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dbd5ca18b---31495868235.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d04435bf58a---tedanuziwuvusesu.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/ragixajisegufubaputule.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/wudas.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/aeb24d7cf02ed0f4b38c4eb79d554afb/popuge.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77b6b7115a---kivokipafeseboje.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609bacda7a8fd---reratenowiperuwafiwidomop.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/jagizikeb.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/fugeteladinewotefadet.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da7e6cdfe---natukomugebijipagipo.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/83443550181.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/demuga.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf50b9cd1---wuzadesepase.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a58d7eac3487502d2881a251306d3c03/durumexavivadep.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9a3f1b1073efa68a39ecb7bebc9513b5/7626704997.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7ef12190bcabb16facd73268fc943784/71282639327.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/29838081687.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/binozok.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/32378441612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=formal+logic+paul+gregory+pdfPDF 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_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 17404 bytes
SHA-256: cb28bb5e578891c815e15922e2877f6d3c15a4ae195e9049d1e451813b9113f3
font_01_sfnt_off00012f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001474e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474E 10784 bytes
SHA-256: 349537334abbe1d887144d2919bfa309615fcbe672ac09a19b549703d4102790

Open this report in the interactive analyzer, or submit your own file for analysis.