Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecd0f8fd6b9fcae…

MALICIOUS

PDF

82.8 KB Created: 2021-06-29 04:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd1f23eb2c51d4cc38fddddacc4a8303 SHA-1: 6f6e7db3d2d053a2feb0e42eec1631e13329ac70 SHA-256: aecd0f8fd6b9fcaeb2ddef3ad6fd0e058aad2179b440236362e56fa9d7a6d84d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or downloads. The presence of external URI heuristics and the link farm detection further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608146c5c12e3---50827628043.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/d6210johim092cd842h2j1a59c/japoxupipinowego.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/187f79a1a3c0b3ef4822d63e90187b53/88313668034.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/psb3pmpuh1sna3fqf14c7918p7/51134960702.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/86bf833288b6fc9c36e110e2a9179c56/95821723625.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9927f7e214683fcdd25f5ec9ef40f4f9/kusawazidimid.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3c3bb99de88ef0c88ba4b7003f518b21/pisanobogomixa.pdf
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/duvama.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baae6bcc5ec---37546897007.pdf
    • http://say-international.eu/userfiles/file/66456295192.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4e0a901fa2cd007bc8bc0d278926e7ae/93647606447.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/970f50cb328ecd994aa7cc4aca8332e7/9522784282.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e226e5ad18---fusejejilapidubevakolade.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c544d3bd6---dinonidukenomoputu.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/pj3qc698g6mr9o9027uchvpchc/rakamaxesenajinarepuz.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160754c1fbf816---49147753366.pdf
    • https://soechi.com/userfiles/file/rutadoxi.pdf
    • http://badaranquehablar.com/userfiles/files/90830429990.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3531086ea---segajajesobevamur.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160799ebf87131---2834617120.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ca7ec13ac---nesefaj.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abff3bf0e4e---furebotodudijakasemimokew.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3abda5aa7---xuzupiguwemejupanaxeku.pdf
    • http://sixtyguildersresearch.com/admin/photos/file/bidekufisijumirifigisabit.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a91c37b314a---gunok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=conversion+of+flip+flops+from+one+to+another+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_off0000dc69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 16792 bytes
font_01_sfnt_off0000f480.bin
bd40ed01c10f68f1b71a9bb3424743e4f4fe137231d1d9d9cde95479cd406c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 10860 bytes
font_02_sfnt_off00010d6f.bin
ab96a4f30f80c7fadfd95733797a55acf0648c2d3a7c17a0331680a597f9d584		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 19152 bytes

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