Malicious PDF — malware analysis report

Static analysis result for SHA-256 5176dc23ff0e4ae4…

MALICIOUS

PDF

87.8 KB Created: 2021-07-15 14:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67f126623a67770dda558514ff8cb67b SHA-1: a5c35f831c0d3c464960dc528ac8ea83f43cb0cb SHA-256: 5176dc23ff0e4ae4871c179961ef24667e7518d151dc26d32dd22d165302a392
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a distribution point for malicious content. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL targets point to a malicious intent, likely to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://smidgel.ru/uplcv?utm_term=technology+and+innovation+meaning
    • http://twxcd.com/img-aim/files/jepoxeti.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a81445d5c1b---82755693438.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/fd6deeddb5ff71e5995a8f464599e027/litirotezategaxogevefel.pdf
    • http://itkaufmann.com/images/fckimages/file/7183006166.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/12356866529.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609139bd3c079---nasinoxife.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4380605a---guxetapasidezulovurolo.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/efoi1akqkiphes70bbu0jsqood/52136557878.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a47d922a7---mesavojuxezizazabaxifabe.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b9f2e1f16---jirurajonag.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6d67ffb02c3cff464050db206bb1f822/vejomomodarekifupoz.pdf
    • http://anhbanglaw.com/userfiles/file/feboda.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/cb7c5b06ade74075245d45b37bee064c/95131724513.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/db4tm2j09li990lbi7qmq23u2j/xowofonevefifomovikuloras.pdf
    • http://tmtechvn.com/webroot/img/files/44745600185.pdf
    • http://cedule-plachty.cz/files/file/63206491160.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac92f17d13471e3806c810e6e535d160/tirulufuxiwew.pdf
    • http://asfalon.com/__files/file/kidakokabifepigib.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2875e28633---36348274476.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05113ca83b---regebuzujibuzujukovabi.pdf
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/buzez.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ps0i0j0bk9gq7a80lfv1n0hdv2/39385890940.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4256c3f579d3c67396b52d9cf0edecf1/neloparipenoxiramivap.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/072932c539aa5cb53c109c22466d77ce/ludefodifir.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a3a966df---dagojinonukuma.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/02b9b940cf152353381913b71fd926a5/18434598175.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3d27307012765825187c8774f40d1073/32919079337.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_off0000f67e.bin
05349f1381a468c7b3847314595728f225ba1322b04cc31333246fa6a1cfaa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 16556 bytes
font_01_sfnt_off00012188.bin
1305d4c36899a836da2cbbeb0d302d312e151d92d6317fe070c27e1e0cd44647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 10692 bytes
font_02_sfnt_off000139b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139B1 16792 bytes

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