Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb6ff1a89b89b1d…

MALICIOUS

PDF

69.8 KB Created: 2021-09-07 06:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b165020c3a6a2ab58cb286dac42c3d3 SHA-1: 53cfe89a0e360ed53aac3262f3a10be4c8b86f23 SHA-256: 4eb6ff1a89b89b1d89956b233bdfcf921da40f85e703fc910f2b96343815543a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://gadd-asso.org/userfiles/file/68224422033.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d184b9a1b7---tefajefafibalevimudek.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/63489809355.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e79cfd7614e0510e80e3ec42a8b46118/76726632189.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/voligud.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/98288571835.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/mapuvibusanatabilawufuza.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/89433583560.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/garuzilugododewil.pdfIn PDF document text
    • http://novichiha.ru/pic/file/wudek.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/7858453812.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/73374956278.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/24869027515.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/22642202456.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8dd1a1edb---fexekabuferagaxodemored.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f1085467fa32eea0cfc1e4b1bef7b5cf/44883195386.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/e72fpuvftovdoiv8efoh9upj62/37109252715.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/083eb72db2c4095073d4757466ca69f6/xugovuxuxotu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985c7d003c3---95192439878.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a431706e0---88910071510.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/vudaxaxaronesani.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/35556883227.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/purafawemanupo.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/74794998024.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/f405c1ecadba9ae3c0227131dc84a064/94850488397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=marshall+fridge+manualPDF 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_off0000b60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60D 14288 bytes
SHA-256: 7049fb533135ee26eb5210bac351448ea2d066cbe5c2d156379948d2e4695292
font_01_sfnt_off0000d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 10676 bytes
SHA-256: 47a8d45b90bc0f0a9b53c8885d755ead7628c69a3b374e5a7c53a694191d496f
font_02_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1