Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f2b3a36c156491…

MALICIOUS

PDF

89.8 KB Created: 2021-06-25 21:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a582b346f859cefb6936f3af852b454 SHA-1: 32e5abbc5a8cc932c736bd80cbba15c4c937924c SHA-256: d6f2b3a36c156491283ded655b020af6e2b3728135cc50ea22caa5b7f4aad32e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of many external links suggests an attempt to redirect users to malicious sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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 http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54e09b089---nutabamaromalujulilebediw.pdf
    • http://lubrifianti-auto.ro/files/file/70736396431.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985a7148f69---firurefavopulejuminumo.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828fcfbbae7---voxobasevabifulekugurit.pdf
    • http://bortran.com/upload/image/file/20210520073318.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609748ef7910e---54625038261.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607568f73a932---8930968443.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609438e7e077a---sirarurirok.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f9e4243624727e16892bc881e9e5f61d/zutorefod.pdf
    • http://boissee.fr/userfiles/file/tiramuzogukobidinajaxel.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b89e8e94a86c63036e0a7b1bf09d6b58/jukawos.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f655dfe7---5511217300.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa159ce33ec---rosunaju.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/35596730977.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9dd21334292736401cb487bc521b131c/webenomusakubakir.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb5211ecc---91833936141.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160726c8ad2490---89072877097.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qumlvvg9flh2f3emkah6vmn8m7/turudefaxi.pdf
    • http://vencedor.coop/images/admin/file/34313615639.pdf
    • http://jar-ted.pl/file/39398567559.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/98a8cb0e699377e7656ec333c7595ea8/56540114931.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ab07cf88---76466350592.pdf
    • http://nomaquito-travel.com/editor-images/fubajogebivufuzexofezupug.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=international+women%27s+day+questions+and+answers
    • 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_off0000fa59.bin
3db95389844149272fd5e0c9688f9a17af9f74ee7a2cae0109d059cb81398125		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 17168 bytes
font_01_sfnt_off000126f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126F9 16792 bytes
font_02_sfnt_off00013f10.bin
858b23579c0a897a1867b4e401634c2079abed525c20b15fb816cffa95229828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F10 10840 bytes

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