Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81f23572b0b44fb…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 03:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae9ff2df5d773c1b0dc33abf9eca0d2a SHA-1: d397bfc2f2f9662d5bc98a1d7c598f403be10645 SHA-256: b81f23572b0b44fb7c84a23be49207a09cfbed119914c24632e819b37fded1f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://laborke.ru/uplcv?utm_term=levitronix+flow+meter+manual PDF link annotation
    • http://movietek.vn/hinh-anh/files/melumot.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/13663368003.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2cb6b1633f3fe4703cf1cfc3a56663d4/kororejubotagopurule.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/badedin.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/pqos05io048m9he8fcdeh0ajr1/gaxarawejipu.pdfIn PDF document text
    • http://agama-rc.com/upload/files/zivojutupugabolum.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64db95e4e5---20297710631.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/679094837.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5b73b2a1cee472cbec33b3dc638080c4/91092175157.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/xonaviwadotexovokenofad.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/79195431536.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ece41d34---dizozeruxilidepiluwodona.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/suxejadipixo.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/26094184232.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/sut9kcq4b0oeb4vd2qi20muidi/xiwiwatuz.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f78108bb5118e593a057e860e690c1c8/vefij.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609df06ec1db0---wulemugisizevofokunuge.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0fef3ef0---57983643747.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/9400480919.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/100924d3aa0488e4d8eced9590f01340/76825972241.pdfIn PDF document text
    • http://kco.su/userfiles/file/7209581418.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65485c5b1b---82105630626.pdfIn PDF document text
    • https://chptravel.ir/data/file/japijuvajozim.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/wiramav.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_off0000ca29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 16876 bytes
SHA-256: 78c12b9287c53ee8e53bafd52adebd2408c91d2351a9ffcc4765a51204acd91c
font_02_sfnt_off00010d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D76 10516 bytes
SHA-256: 5a207e5bb2c2a0c45a779c4b4f120e53fc46fb646b1713051603aa01237edcae

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