Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fdb5657de41a03…

MALICIOUS

PDF

76.7 KB Created: 2021-07-06 12:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6040dc38631b3a36e1840ee1b5ba05a SHA-1: 7c426abd16d510a69c0e852b5174a11098eef9aa SHA-256: 56fdb5657de41a030496a9ea153cfa90e971e90b87d879c49348e72f99bc41c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and compromised CMS uploads points to a tactic of leveraging external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=oxford+english+picture+dictionary+pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe1c99f8c---vuxamurazetip.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5800115cca---75050235678.pdf
    • http://luatsutiengtrung.com/app/webroot/uploads/files/53963504036.pdf
    • http://matchonusa.com/uploads/files/22018924598.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160879732bfcbf---74324047422.pdf
    • http://ac-kenigsberg.ru/files/file/80391655318.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fed4ca146aeee9b44b7f6d02a56e0ba3/87323700092.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b78e6611e---27040357091.pdf
    • https://vntdc.com/upload/fck/file/sulefupel.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad545db7e6---26062076948.pdf
    • http://arci-mp.fr/admin/File/febevasezam.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/d8ur2sm6nrsde6sgo6e4mpfkug/ganewa.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16083b60b59188---79377294769.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740ccd7a65a---13538280825.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ec56186elkh7qlt6441l3mhe70/51907527773.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b37d9b073c4c767e66035187674bb2ed/30594219038.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160872313d95ea---negibibizididubogik.pdf
    • https://oliogalanis.com/file/memiri.pdf
    • http://chongros.com/userData/board/file/77332193914.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160770c5e397f8---majiputodaz.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c78a8b1a0ebada29b33c92b67d3eb43f/42740804556.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2877800c9---66116345443.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aaf537835---pofufataw.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160789060f1b88---fikilupelezazova.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608392a122c97---wenogavolimozotozej.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_off0000c734.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC734 16792 bytes
font_01_sfnt_off0000df4b.bin
fd9438a0638471d29f0aad7f5d93794fb71f537e818d172118d20ccd31c17c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 11240 bytes
font_02_sfnt_off0000f966.bin
d9bc6f0e8ce380503ff2599fb2ff7c93ead0c1b7bb76d2090d511d7cb28ddbc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 17064 bytes

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