Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a48ea1108b557a…

MALICIOUS

PDF

87.6 KB Created: 2021-06-26 01:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5463b77a083c64de76979c9a2a9ae2f7 SHA-1: ebd0ef8378c4ca59311813fcaf2c1e989fd085e4 SHA-256: 97a48ea1108b557a67d006595a0dbcf8b07b7c374f8f5a57534d8d66367336fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL analysis point towards a phishing lure, potentially using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0840fca490b9e5936946496fe4a545f2/62453806994.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/s3gvr2e1ul4mt0r1b8fvjqlet3/xodidipaxivezesuduxub.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/f2gev6d7p5ifd9tfqkrh00ao22/19862241981.pdf
    • http://cuatro-pr.org/sites/default/files/file/42605509769.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b58cca3580---43960919784.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dd8c945c2d610298f668681c0096795e/miduzesapad.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160786adea2664---26131677073.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1242fc7389e28e9669c0bdf5e8379668/wumaxak.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e828676b---22324812634.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/e2e01150ee947bb5e69056239ec0f28f/80730395629.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2dc3985b7---66523075160.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/34841728066.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a00789b547fd4d382191fb6ae080445b/78209479082.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608343ee2eafe---98401653648.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608566fe231ea---31354543346.pdf
    • http://headrepublic.pl/images/files/lebel.pdf
    • https://laser123.com/geektic/files/67390723474.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add68b808de---godadewib.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f5fbaa65f7ec150ea06ddb214773724f/43632930409.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e735f51bac92130365a73f6f14871124/kirifugalopotigoral.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/4219250cc81a18fbbef39cf3ff5c73a5/82194529764.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/27482739800.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d966c2067d---15797094634.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ed88a071---68534719962.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090b8cd2c5a9---30595838538.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=business+law+and+taxation+pdf
    • 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_off0000f2bf.bin
0fcb42a4da6466c01f39c91bef127d4889107ba14ac882b8eab9c970b227b836
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 16868 bytes
font_01_sfnt_off00011e3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 16792 bytes
font_02_sfnt_off00013655.bin
daa1690bbadf632176d06a9c8d87901245eccd89ea2b4909893c7d6fceda5197
pdf-font-stream PDF embedded font (sfnt) at offset 0x13655 10732 bytes