Malicious PDF — malware analysis report

Static analysis result for SHA-256 3651575dd49f9325…

MALICIOUS

PDF

90.9 KB Created: 2021-06-28 04:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb92e5cf31adc72012311cb08f1ac8d7 SHA-1: 77971fc5b90be8cc452fccce33c7c447ac3b6f7b SHA-256: 3651575dd49f932515cc9a8ca05d12efcb3989da9e85882a3fa9d0f0dcb0a719
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many pointing to compromised WordPress sites. This structure suggests the document is intended to act as a link farm, potentially leading users to phishing pages or sites hosting malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://archism.ru/uplcv?utm_term=star+wars+edge+of+the+empire+beginner+game+pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67fa74f1e1---vawunavilasolaf.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/574d9dc3eadc4287fc1ac7510359c67b/6125885311.pdf
    • https://ivanda-commerce.hr/userfiles/file/kudufebimaravavanekizimaf.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27f81c88d---potapizujuwovi.pdf
    • https://atlastoursntravels.com/userfiles/file/wunavosowupilujizakafo.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/bb1301c40dae7e34b2a627e36df40d74/xulanobaxanoso.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/3f1930dc56c599960778bb4a8fcb6eba/78910966165.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd6ad1a6f---veziliretupubebolalutomeb.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c19bb55cf02d46fd43b5e3df679d2566/lilaji.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vinq35d461pnq6ke0amnnqrgv3/65252819941.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f0444f8b4---keluvosijabupokivavejono.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/cb4f9033079b8aa285834f414f47f1b3/gaxofotadotisawopujer.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/943847ac78ce7245347b6e19d11cdaa7/sagotetaraxa.pdf
    • http://tomaszskiba.com/userfiles/file/13692997954.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d04ad1a58b3---28458495946.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/79dee271053cf99ba8dca26eb9ebdb66/zofamiw.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74a1ea303---28057096518.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073de517d577---55888338327.pdf
    • https://bursac.net/userfiles/file/babodotifukezof.pdf
    • http://morethancars.nl/uploads/edytor/file/mufakoxu.pdf
    • http://christopherspubandgrille.com/userfiles/files/13413666086.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdddb57f62---setutetilofi.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c2ba9702e741d90c9ad75154fbce5f46/duxupaxenok.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/7530416b33c30fd9a29386efeba7e4dc/84135125873.pdf
    • http://zavalinka.by/var/upload/file/fedupitinilazugo.pdf
    • http://say-international.eu/userfiles/file/tapaxagubalugajesufasepi.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_off0000fc21.bin
20aa5415df8710b68afe6612193c695b4a07e2f9202fdfa4bdb8e0abc83a8634		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 17556 bytes
font_01_sfnt_off00012a5e.bin
b73e64336acdc0d87cdecc3eea5b5b500516ca48afb7c1a7c6bcfd89e2ba9a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 11200 bytes
font_02_sfnt_off000143fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143FB 16792 bytes

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