Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a0a71551efeb65…

MALICIOUS

PDF

87.5 KB Created: 2021-07-27 12:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bfcd3f67eaf6c18083a2af05de6ace8f SHA-1: 6979229c01212f26845cf6e5e4b5e6a624a94e99 SHA-256: f3a0a71551efeb654ef9743cc714c1d1c1450f38fbee812f1e8affd86399eb3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://rsun.pro/admin/ckfinder/userfiles/files/mafipulorerenezitorafobop.pdf In PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/ba60c4e0f0b9d8ac642c41c5fbcd0b88/89627313965.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/kefinuk.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/82ud0l0ofdhgmabip7ujtoapd6/borigipa.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/lebafumorijibume.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/wuzuwuzorupav.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/4upjsac0k1ogaafej0d8sef0qp/1176823847.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/13500371731.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3be76d1c5---lozidobikurifisizefil.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52806495069.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef7f67de0a---24319638179.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160740eb66b8df---95724203453.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/givakodusawumabefupajo.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/regupivigolime.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/71884846445.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/muxez.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/20317488950.pdfIn PDF document text
    • https://kede.org/userfiles/file/54329906272.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bf971f9e9dd---danuzimedal.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081420f76602---ginipuvulajerukad.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/mitodaliwugagosokenegubok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+many+questions+do+they+ask+in+driving+testPDF 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_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 11244 bytes
SHA-256: d13cad242bf9bff31afc267a92cca0611ec129f810d9f18a370073c5e2a39aa1
font_02_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 16868 bytes
SHA-256: 1ca50e326ad792f220a41fc4539d04bcdc9988d09e6813090e942b3ca9731cba

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