Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1aa677d541e1ee…

MALICIOUS

PDF

89.1 KB Created: 2021-08-16 19:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 734651d96289af794e56f1b62e51c7f0 SHA-1: 4be77a6f74ce93bb6878e7cba7dd70235fd734c4 SHA-256: 6e1aa677d541e1eebda33b641afee25ba0e9a1956ee3400a3ec9196122de7406
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=super+brawl+universe+nickelodeon+wiki
    • http://studioagronomoserragiotto.eu/userfiles/files/93636502275.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609111de0087b---30788967073.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607831ee9fa38---55207025603.pdf
    • http://tomlitkom.ru/ckfinder/userfiles/files/fawesidudirup.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc242aa547---lewibat.pdf
    • http://argyleliquidations.com/userfiles/files/narosojugevebozipe.pdf
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/71515322779.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a639a12ac0---74172370953.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160801c68e0e32---vebetitezabuxokor.pdf
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/debunogesokirapetolad.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d04579e176f---55247546171.pdf
    • http://metabolit-plus.ru/files/file/14382499114.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609e479b55503---poxutazu.pdf
    • http://saltokisport.com/uploads/files/67350120503.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4d946e7fb---51511777194.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaa9303abe---16054749343.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/jiwowibod.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9911179ba67eb678e4a556c709d6ed32/17285859700.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896fda17136---gutupoteje.pdf
    • http://www.pratikchoudhury.com/fckimages/file/94812515739.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c53c04490aa---63154133332.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/09cf02e5c29bb2e93f9e22e5d5731763/dupiwi.pdf
    • http://spbmedax.ru/sites/default/files/uploads/zejef.pdf
    • http://unsersohn.ch/images/file/pipudazoditowitikebezovup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 16792 bytes
font_01_sfnt_off0000f8e8.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 16164 bytes
font_02_sfnt_off00010e5a.bin
4be3538868dae78ab7545156f2fbd329f354d13a514f2d4d10f19101963b2fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 17308 bytes
font_03_sfnt_off00013bb9.bin
4800bbe1d14e2c39f8635973e5253a9d94b3faf0f33824b44956741cbc886f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB9 10968 bytes

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