Malicious PDF — malware analysis report

Static analysis result for SHA-256 835843f809fe62bf…

MALICIOUS

PDF

85.7 KB Created: 2021-07-14 02:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75e47b1f271eedc0b0824d635e8bd5f4 SHA-1: 5d363a87d254d8a0ed270c52fc608c795c7e4f2d SHA-256: 835843f809fe62bf25e91c1e11af655798a5a81c2e79b3f6064d9b3c4fb10a58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to various compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://audreyheselmans.com/_files/file/vojutuvorijo.pdf
    • http://taxicityplus.ru/userfiles/file/4339366433.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/92403016629.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ffc59cb5a---siwupa.pdf
    • http://dioceseofniranam.org/userfiles/file/korosikepidepab.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/dc92641c0b846910c9f1a9864deab56c/75373298239.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/e9js49h05s0cst9ui7iltqv9uk/purarono.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e1f7fcfd---53904620985.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e16a8c78---porajobamu.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/67022735092.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607140530fde5---28068638628.pdf
    • http://dges.in/userfiles/file/20473964108.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c64db221---91882273653.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160746052ebaf3---lobuxajolawojebelogapuj.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbef7f41ff---50756027361.pdf
    • https://isabellepieman.com/userfiles/file/bajom.pdf
    • https://egca.fr/userfiles/file/xemuvifadabapuzebowaja.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/7990255309.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/11ml0q8pbc3mdk2ik2enpgqfk7/vipibejixupu.pdf
    • https://stvorki.ru/files/file/85451054452.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/b02531ieifnpjon6fpcvi76d42/96025308702.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/16e1e2ad0b8bec30ba150e46a6dcd7e2/gozijeloludakosadejekale.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608197b2594fd---rurejugobukuxegum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=irony+in+the+wife+of+bath%27s+tale
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf4.bin
43500fafbafeed62c4b8c6e4e1ec730f2b321887cc0d0cc5675d912f596c8da5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 17252 bytes
font_01_sfnt_off00011901.bin
ace327f39f58912e13afa5db9bf8feda3f9e9a67fbff0839d6688a14b70c04c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 10636 bytes
font_02_sfnt_off00013167.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13167 16792 bytes