Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09205faa6bf4579…

MALICIOUS

PDF

98.8 KB Created: 2021-06-26 20:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 171b317fecfc07995d002404809f4fa3 SHA-1: 7a9d0786a863f011f7d38693bc6b1ac83f8a6455 SHA-256: b09205faa6bf4579a602443d92cdf684f106a3ee94f39f7448ddeca5dcb8e4b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially compromised websites. The presence of external links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://crewmak.ru/uplcv?utm_term=plants+vs+zombies+journey+to+the+west+apk
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29e6afd82---mogafopamazubefuludaxelud.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160831644127c8---11637486344.pdf
    • http://russkiivopros.com/images/FCKeditor/file/nirimufokutewu.pdf
    • http://dinskayarealty.ru/media/file/dasafuwasozujitobaze.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa3fe86b5---solanijumuzikutuk.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1b83acd0---75438032837.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160829f49f07b0---14769831211.pdf
    • http://anaminfo.com/attachfile/file/7696228814.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/vekoruvinesazefugen.pdf
    • https://zold-kommando.hu/files/doxuvamizoxixidikaluto.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a514b2055---11444132507.pdf
    • https://senhewood.com/d/files/nazubemiwugebuxoxirevad.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/3d8dc118a1f9c690c41e3ee48f7d3811/53783229369.pdf
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/zexawadaruzesufesuwik.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/48660663013.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6opfg1tvbnq55u1oa8umqfs7n0/basejunulenapituxufum.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/36251790896.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16084c5f3f010f---5275454846.pdf
    • https://nnt52.ru/userfiles/file/52654661998.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c761aa6a46---befifagumorusuk.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/5d931647b641362e7065067be4563b33/mifemasedokamekusov.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/cj2lcr3ohfoh0o0aqu4k0busr4/84931466189.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0a3811b960e477291479ba6ecb8c9b1c/74422639441.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee90.bin
37e231cf7e7ef805c41fd6a916f3ff7c1c243945ed348f8404c906ed0d00465c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 2764 bytes
font_01_sfnt_off0000fa12.bin
8d1f5ac43b54b2cd76796c94269c44ee081a6df0fe34b17daf13497a0e8e74cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 16612 bytes
font_02_sfnt_off00011085.bin
27db63423aa5200233c29888814a58666ce6f236f04a1c2c95e1c25fd478dbfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 23308 bytes
font_03_sfnt_off00014a27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A27 16792 bytes
font_04_sfnt_off0001623e.bin
a7cd174706fa07e277d2f2e66e6fef3e940f054ce5b964082396677297b686ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1623E 11304 bytes

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