Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c624304b40d011c…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 04:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 842800396c0e116a9fdce7f46900fa5a SHA-1: 2c52906b49454e65cd9751d59e634b1d432b699b SHA-256: 6c624304b40d011c90665be175ec738df5d9763b7e63cf9cd7c95aa0bcf7f00d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://signika.pl/Upload/file/73097922117.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jshrden8dlscvcn3degb3c58l2/64038056383.pdf
    • http://aldara-latinoamerica.com/userfiles/file/zakoforigusewu.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094521a0d958---jirovaraliritalenifo.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607815bb03a1a---5238032075.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607da28fbc201---gasopukuvuzepago.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c77023d60---zoxapotunafiwonavade.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/403026335938eb94cf9b6134cd2d30c8/pivatelifixofikedaxe.pdf
    • http://project-lovcen.me/userfiles/file/27153291973.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d2936061a---43322050695.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/r02i05ebnkhq573f1kbq6ap54h/kesuzuxejefibep.pdf
    • http://artgraf24.pl/userfiles/file/zitetolip.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093e74464db0---87600728424.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e51e8020---14221865130.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/92e50c1f2200415ee1f208aae1269e6a/55810176078.pdf
    • http://petra-dario.info/upload/datoteke/13777703175.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160864b6fea721---lowufebux.pdf
    • https://bczenekar.hu/files/file/favumakiwuresibemowitave.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92431bd03---rawameberiwawaveta.pdf
    • https://foundryindia.org/userfiles/file/89145370783.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607432ea9470f---masilusumuvav.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160825bd63bdcf---todogodora.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be58a75e22b---lubibuwo.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d249a930b---81017314360.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/ba242b5a1fe7f7b9d65474597ece9faf/9463112228.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=find+a+third+degree+polynomial+with+zeros+calculator
    • 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_off0000eb7b.bin
146e326ea45f9e53ee74c0db8f6212fc59e98c3f26303d0170ac7a336495f38d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 11300 bytes
font_01_sfnt_off000105b1.bin
aaa9877de32d684992bd67df5e0b7c25565adbe2d2f93a83b43fae6257ced08d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 17300 bytes
font_02_sfnt_off00013349.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13349 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.