Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bf71a7348c4a01…

MALICIOUS

PDF

136.6 KB Created: 2021-11-08 01:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0b52ee77ae6a56330c9a806dcd6cefba SHA-1: a5c223bba39c49de08bc2994b1a2c3542da718cf SHA-256: 73bf71a7348c4a01516bf677a7cdbd2b997073771e3031e4f5981307d9ed317b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress uploads or disposable hosting. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://philabc.ru/uplcv?utm_term=copyright+infringement+in+music+industry PDF link annotation
    • https://lanhcongnghiepthinhphat.com/upload/files/11996297893.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161565ae89cc31---39282894775.pdfIn PDF document text
    • http://yachts-trade.com/files/nizisuxepa.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/vokixifazeban.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/bawabalonidupek.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/foxogatufijiz.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/balagifinusizoganef.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/xarokimotaredabumipe.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/38152045711.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/58232252534.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/gafexidojimav.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/zawesanumipemipukofedut.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/nedumifavekujujufokale.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16184d54d94d29---82806747251.pdfIn PDF document text
    • http://regiapart.si/uporabnik/file/46969806956.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/popesonuvasuwak.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/pedojejobulirowuxijivoge.pdfIn PDF document text
    • https://apagar.cinemadossertoes.com/ckfinder/files/nurefonulowolerikomuw.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/jikitupuxeguz.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/tawokumajejut.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/dovabalomepugologoger.pdfIn PDF document text
    • http://hongdacable.com/d/files/tijodalamejajow.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcf572060dc78ea731384c4a61768c90/lopatasatager.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/43131968319.pdfIn PDF document text
    • 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_off0001ad35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD35 11104 bytes
SHA-256: d51f1a476ca8ff72b90374f1d4181d13d71027c811031a926c618054ad67656e
font_01_sfnt_off0001c6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6C9 20576 bytes
SHA-256: 991e3e56c03546f854dfcb5ad7746ffa83e45e5d5865f6409df050667f92eb37
font_02_sfnt_off0001fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD07 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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