Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b99fbccb5728cdf…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 06:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 29c97f1021131aae35ac2acd56bf0ce0 SHA-1: 8f50ea65306b71401120e45bf50586a751099268 SHA-256: 9b99fbccb5728cdf9871626df705f3ab307dbcfb02accd2aac593f302661364b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is classified as malicious, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to distribute malicious content. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly indicates the document's purpose is to trick users into believing there are changes to payment instructions, a common tactic in business email compromise attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://shinies.ru/img/lib/file/58958270357.pdf In PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f215030291---jupedewogajovetikir.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/409e99df5ca6c059eccef679c8538809/gasugotebojenumosarade.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd868a7688---gazumiluxisifugesiw.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962b95ad3cc---dopem.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mobiziromel.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/63b129c79911a4166d89efa7732030c3/terovevemunujagurodiwo.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210714_062725.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7dadfbd42f36c8e8866bafe2716e2507/gulife.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/65949524107.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/62008804821.pdfIn PDF document text
    • http://aa-nusd.jp/71842955781.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/57776691833.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/aa46215e07913fadab739d63ba853124/45448396170.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/sajebolenasulopod.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e7dda1e3a5dc9b35d116dbdecd743869/93174402400.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/xutokuvojamavo.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/91800514067.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/20199772120.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/32253969160.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/d13c170edca6d0c9c2d54bae99d312cc/95228160401.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608025da2cf0e---12469117563.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/34608495337.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5569e1c80---69348850702.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/36370504413.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308cc66a93c---26603381645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=single+entry+system+project+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 11120 bytes
SHA-256: aa99a5b55fe6092b8341c34fa32a59bb87c9759bd3fdd011cba6d111856b699e
font_02_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 18296 bytes
SHA-256: 0f1704646febadbb0a2fd156049a5df391960f6121a0627f3c60dde7a934f894