Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0264926e0a74300…

MALICIOUS

PDF

98.2 KB Created: 2021-09-04 14:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a32372575e3bb1baa79ae7d68ef9624 SHA-1: 2e5abfec06a37878c3a7c5708d1a6aaf045bbde5 SHA-256: d0264926e0a7430091cde3b5c7011e19549ee50b6f87b42e2d65882bdbc1fafe
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various websites, some hosted on compromised WordPress installations or disposable domains. These URLs are likely phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://chcial.ru/uplcv?utm_term=12+imam+syiah+pdf PDF link annotation
    • http://beta-rc.com/upload/files/77714489016.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/77064355988.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/tabugolukiwibadupur.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad2cfb107b---33452941423.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/20475015168.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/33658390622.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/47dcb69dfc150d0ec01dec173dac5b16/nupiniragawakunijisono.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/punozi.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/5129808881.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/biwizojugaxiv.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/06d796ac60931ad53dc8338a5bee308e/60282329914.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/fuvuduzevedafulivojokoti.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/06d52ec882b32b885f395b619802737a/26489099996.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/93914744700.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb8d067e6e37df35e8cbdea5153e668e/befep.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/oatk0j997qkr02q4n2nhn585b5/lezuzuxudikaleroruri.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/zufajosowox.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/derufukagimunudupik.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/46jpq83ncmk3238slt9kdl3hf6/vovazexumim.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/t3m6bjo6mid6gff85vask5at33/8987233643.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/36vemohu1c66qteuejafla4du1/14631502595.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210802110004.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/fodazewupuze.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/rugelabe.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_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B6 10352 bytes
SHA-256: a653311457a286270436839cede18940c7986870f448a2e80eb2238c935469d9
font_02_sfnt_off00014019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14019 23084 bytes
SHA-256: 097e7376f4aa10736b1bb06c4f477114356bba344587ad0634f3905ef42de94d

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