Malicious PDF — malware analysis report

Static analysis result for SHA-256 d743b3a816801cc7…

MALICIOUS

PDF

129.1 KB Created: 2021-09-22 16:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 200f9326c9ef7a4ab4643ff021b7d971 SHA-1: 4ba0083669ab0536bb260be58df620fd7ca2bd57 SHA-256: d743b3a816801cc72e034972bc2f7ae8bfd90359eefe4ac21bbab2800ca4df18
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=super+mario+2+snes+rom', are likely used to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8577

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=super+mario+2+snes+rom PDF link annotation
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/85965304253.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/56765639820.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d6083e10d---30795873373.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/38073812291.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/164896712613c68900b356.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/vuvaxejegusupivamizilak.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/95511447579.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/mufimimurolukifoxu.pdfIn PDF document text
    • http://vce34.ru/attachments/file/vojozexagemufabelet.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c65224bb90515b8c42c5d89f62408a02/kigemanewigusatafaj.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/tajubibije.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/23974047013.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/28156469247.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/73278433459.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/20535122857.pdfIn PDF document text
    • https://preciseenergygroup.com/media/seset.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/vukazojados.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/belebixosotaje.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/nosebavipizodotisujokeki.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f07d75487e---5504984967.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/58186412300.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/12334511878.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/kazikepejotavage.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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