Malicious PDF — malware analysis report

Static analysis result for SHA-256 3426959a5e51cbd3…

MALICIOUS

PDF

96.7 KB Created: 2021-07-07 16:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1a2bf2417441da88ed2e3a15dbf1d414 SHA-1: 7b82fbc7900b3e47f37c5e93da672754ac0edca8 SHA-256: 3426959a5e51cbd3cbe55bbba6a72d18a0eb37702d9208ad302f3eb543630d88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs indicate an attempt to redirect users to potentially malicious content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://infrive.ru/uplcv?utm_term=modern+architecture+since+1900+chapter+summary PDF link annotation
    • https://andhimazhai.com/images/files/zabulemuwabudufebego.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f7521729ea540089493fdec48e0f35aa/poposenuzubuwogez.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/pu4lvsam3efikjcogd21dj7qgj/67823745650.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b4bdea508---medozuzi.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6f6fc38f8afeb5bba61a9894e11a4184/muvugopoj.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/15562919831.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/rogujilitagadivur.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b05494b07fe---44653231810.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/momirinoba.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/wimexogonupa.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/308c4c461dfcef25c1853f1575f8f74a/xelibi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/4nh2ljfakron9hj5r1mhtjrkk3/zabiwevufer.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/buvumitififividopoxono.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e4961157---92098533230.pdfIn PDF document text
    • http://hydrem.ru/images/file/82180183041.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16081d94b9682c---27296479292.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/oghnhfmbioudtqlqt51m3u61bi/mazino.pdfIn PDF document text
    • https://cubic.is/userfiles/file/53848879991.pdfIn PDF document text
    • http://amdind.com/userfiles/file/vomowewinijipul.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/43a118ec53c08bd1851f3801a5e60610/72347359831.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a619b035a0---kijogasikerabevuj.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608687fd0908a---64469237874.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a2db0059---63049289669.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b1c6ec4a9077fa93e454dcea81106c70/84361353059.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/72238631556afb66598d37217edcd291/97950667494.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/57473372225.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_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 16936 bytes
SHA-256: 0bf73b9644a3d0992b2206e24181fca8110f896ffc4cd5de3ab81f5db3406deb
font_01_sfnt_off000142d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D1 11280 bytes
SHA-256: 150d2f6b7ce67210d09222c9cabf9815a3eee2c3cb63ffcc4c456819d1c3a458
font_02_sfnt_off00015d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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