Malicious PDF — malware analysis report

Static analysis result for SHA-256 d326d758b0dfec12…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 17:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f75301c3c28f6b4691c4202fb28d2efd SHA-1: b3f711d83fe7e593eb8486b363331c4060f66dda SHA-256: d326d758b0dfec12b15e3a45a2fc8fe9ce76b7d1706796356c4477cc24805b37
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is a PDF document that contains numerous links, many of which point to potentially compromised websites or disposable hosting. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new or changed banking instructions, a common phishing tactic. The ML classifier and ClamAV detection further support its malicious nature, suggesting it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/rejubobu.pdf In PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613dced8092ae---varujenowizoge.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/82cb397cf42841c25a6962ffc0ca6534/lasinamowulirunot.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/tebevigon.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/39465449444.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/sopuvadabojisazirisile.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/puwavoxufesajixelotif.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/12413967432.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/359172244.pdfIn PDF document text
    • http://trevorhannant.com/xafokuvoxaxiluxab.pdfIn PDF document text
    • https://rotitelor.com/contents/files/63505022834.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/67325147633.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed07cad34---24690673930.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/97080833169.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161420ea3e1f9f---wapovevimasoxufadipugotif.pdfIn PDF document text
    • https://estoniapools.com/contents/files/vuzogamibux.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/65494477490.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/s3cq0ejeabhr7phdb4q7h7qu8l/36251757503.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/poxar.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/pafafixevan.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/19506797226.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///86738982953.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4899f40bd3674d380ec74d0d9a3ea164/futirimovokimajo.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210916_A1DEC92A1EEE4745.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/bunorojosetivatewas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=convert+voice+memo+to+mp3+androidPDF 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_off0000cff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF8 10732 bytes
SHA-256: 2d5468260ceda21783279aad978eeaa88936ab146b4c67191af003ca95ea6f28
font_01_sfnt_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 17408 bytes
SHA-256: fa23a916afa8f1d808baab3d80e696917d3ae53b08d66c9a1e7ae8ab0ad89a9d

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