Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d443e875197794…

MALICIOUS

PDF

97.1 KB Created: 2021-08-05 10:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8e8575684b58b7407cb48670f1559dcf SHA-1: 04c42069d6606b6c265e5ecbb4005351610e3adc SHA-256: a6d443e8751977941fec27f61e89bce8bda71a6e8a34571402129edaf3d4076c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--nmqu14inmf.com/upload/files/fuduzareguv.pdf In PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/46001083439.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c41bfa30a80---zemafuwe.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/78193463839.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/gagodotanegixafag.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaa361a2fd---60412613379.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be76c03fd27---93053933436.pdfIn PDF document text
    • https://faceless.me/userfiles/files/30823067904.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/71717078346.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/begoto.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d8768a88d---xufubovojuludebexen.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/jolozenu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160f04f43c0ff9---52826663572.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/678cd49708492d11c14b9ebff325bb11/92411996014.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a77d735fc6---tuneburekikogako.pdfIn PDF document text
    • https://mmszke.hu/files/file/mifigutaxepivirivafuf.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/28269aef9f1c116527532035b37a72f1/35809215484.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/devonexemejezetutekeg.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/af4cbde68f0a94d7907278c4af4a10cb/74487495735.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160710e178cd2b---83993557789.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d7d2c0bb7---lugezogebufixuzopi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160766e54eb62e---11928449990.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/84907932135.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6309e0384---muzokajexidel.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/giletazuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fortnite+season+6+mapPDF link annotation
    • 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_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 17012 bytes
SHA-256: 5bbeef4a2b2e074dd32f288125e5eb5126a5e3312c79444b808cc573bef16ce6
font_01_sfnt_off00014c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7A 10512 bytes
SHA-256: 4cfa7a56180a2b1080cd23eaaeb560155badfada868d1c5a80d4b3b4c57afa50
font_02_sfnt_off00016467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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