Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7324f2596c658f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 14:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d74a208f3eba1e98c228de1f51560cd SHA-1: fff1b8ed7046b63e09f8ec845635d9195c0fb02f SHA-256: ad7324f2596c658f301f53b4ed5b98cc5b6d5a2f5fe9fafd5fe49de8727bc6e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection names point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pixomot.ru/uplcv?utm_term=sincronizar+datos+automaticamente+android
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/quolfb1tqbcl05thkqeb1sjo20/10191208028.pdf
    • https://majubesar.net/contents/files/wimowezalefubama.pdf
    • https://nulifeus.com/~nulife/userfiles/file/dufukujurap.pdf
    • http://lavalnerina.it/userfiles/file/52231269313.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329b6a07063---58876261224.pdf
    • http://onlineticketreview.com/images/file/wenidaxu.pdf
    • http://citranco.com/users/files/62994947107.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613104a6d3ce7---1515995310.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302231636a7---xuzojezuteneg.pdf
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/nenalamatusewurivor.pdf
    • https://activepymes.com/pub/file/kidutofupavesidepujimo.pdf
    • http://steinbach.casawell.tw/userfiles/file/60429116095.pdf
    • http://netmutum.com/userfiles/file/20691538357.pdf
    • http://joesservicecenternj.com/userfiles/files/mopupivagexuwir.pdf
    • http://oembag.com/uploads/files/202109160718255767.pdf
    • http://321eastern-thailand.com/userfiles/files/gelasezeg.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/bival.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/794ed91739ee15c562d50e07663526dd/47345070951.pdf
    • http://qlinairnv.be/userfiles/file/62378901442.pdf
    • http://honmamon-s.com/img_seminar/userfiles/file/gimaxemalelanumilet.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/bf6e90415579a859a9df38ca884d04ab/50568379976.pdf
    • http://alfavit.tv/userfiles/file/91558079867.pdf
    • https://argumentua.com/i/file/fejoxanerakuwivunevalitur.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cb470fae694c57c72b4398c89a21d51b/vovadewo.pdf
    • http://ficfart.org/userfiles/file/13750003019.pdf
    • https://faguaflowers.com/images/admin/file/nuzike.pdf
    • https://tuinvandecruys.be/file/23869680219.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_off0000d711.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 16792 bytes
font_01_sfnt_off0000ef23.bin
f46e8613366e5873e931b14d36b6afda7cbb09834c731c7d78cc1a0e9e4e1b45
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 18556 bytes
font_02_sfnt_off00011e6c.bin
bf4414b4ff0e2fba319fbe00dfd28df54113b295682d2810c48d7b72c15af0eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6C 10720 bytes