Malicious PDF — malware analysis report

Static analysis result for SHA-256 21428983f227828c…

MALICIOUS

PDF

67.9 KB Created: 2021-09-23 23:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1c8687c507fcfb599954e01483c3c443 SHA-1: 64a0fd166156122af1ddb7c182452f9e35c87de5 SHA-256: 21428983f227828c9bd2a76aa75876f2e7e620044f854538333b01a7604e885e
154 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable domains or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to create a deceptive web presence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8558

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://oniceh.ru/uplcv?utm_term=apk+vlogger+go+viral PDF link annotation
    • http://habitat3.eu/userfiles/files/dupowumugo.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/sufuravutata.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/41079393942.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/fewafuvirinojalan.pdfIn PDF document text
    • http://posuni.com/userfiles/file/87005348563.pdfIn PDF document text
    • https://what.whatproperty.ng/ckfinder/userfiles/files/litaxuworutaropo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb4580aeda---57737209141.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/pagotijiwojajepulapo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386c072c1f7---movoxiwudidenubo.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/37127762142.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/28454190825.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/govomowipanupif.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/17028580688.pdfIn PDF document text
    • http://tcihk.com/userfiles/61550092120.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16146ee33bd77b---62700083899.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109030936309413.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/rokuzefijorufo.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/gozifudetabemotojutaw.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 10196 bytes
SHA-256: dff8cabe039491fd7ddf89b21f9200dcf9a015d5b7d9032b13697428cc8b5b55
font_01_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 17488 bytes
SHA-256: 996049daf3e4bdae0954ac057b14f0a18e3ba4f9d802f31c670888a4d2fc599f

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