Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6908ef4bb80bdc…

MALICIOUS

PDF

73.7 KB Created: 2021-09-01 02:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c023887580733fe3c9a3c29c69764a0 SHA-1: 744eff90467ce6c327d654116b36af7b05e4fd08 SHA-256: cc6908ef4bb80bdc5e78a6d54a34e0e1a815401d55e708d682f8907d7bd38a53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the redirection of users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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=another+word+for+have+to+do
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a8dfe79c771aefd6f8b46533c9f13a72/wurinapabujulizifulenuke.pdf
    • http://thermcom.cz/userfiles/file/wuxuz.pdf
    • http://ersatzmonitor.de/userfiles/file/35860970174.pdf
    • http://abaj.cz/UserFiles/File/bogumulazogelaxebafened.pdf
    • http://nt-module.ru/ckfinder/userfiles/files/wirul.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ed1918817---27176901797.pdf
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/vuxisuwuzojamedalufate.pdf
    • https://b2cexpressdemo.com/userfiles/file/56453253417.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cfe787b17---mijar.pdf
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/71943009571.pdf
    • https://moraure.net/js/ckfinder/userfiles/files/fizom.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/dcf58cd9c4ef08178c61aac889946f2c/zomusuwasuw.pdf
    • http://thuduchouse.vn/pics/file/92418760403.pdf
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/gevolenivepuxebikopejon.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/dd90822ebe285ac11f065e83066e1b39/83785337634.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16250479163643.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940261c724f---mobojegexutufogiwelu.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/59a9544978037512fc39afee5ded5094/janirimebuworetif.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085acada7ac8---59863782179.pdf
    • http://zovsh.com/Uploadfiles/files/pufujo.pdf
    • https://fo-prefectures.com/pages/files/ponam.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c398baba023---2668507703.pdf
    • http://pension-erlkoenig.de/img/editor/file/80372250370.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7a77b083---23429704850.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_off0000c06e.bin
5eb2d4e922160676759b67b5603afb2e4fac220c4d7a6367311ea2e912221d1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC06E 10280 bytes
font_01_sfnt_off0000d797.bin
99ec4f1ae70abc719c333f46445ee9a5d19152d27fb1349ffe5284cecedeb78b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 16100 bytes
font_02_sfnt_off0001008d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 16792 bytes