Malicious PDF — malware analysis report

Static analysis result for SHA-256 c591f7b161a48119…

MALICIOUS

PDF

83.9 KB Created: 2021-06-12 03:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7f2201cadfb9aa7815e93d1c01e5a1c4 SHA-1: 5fa37a873e5c1b3959d273f962ced823b789862b SHA-256: c591f7b161a48119414797d3412b2754a03cd6e0f6c3da609134f0d168546409
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Sword Art Online 2 dub' and wkhtmltopdf, likely as a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8959

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://archism.ru/uplcv?utm_term=sword+art+online+2+dub PDF link annotation
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744a51e9058---99118200998.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/73243974924.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/115ocullu3s01ntelmt9f56hse/zutagedemawudaludiso.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/31581698436.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/9812155819.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1301766d2e5d66d4f805ef718e7416ef/gokilagozuzubokidevemado.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9dcfe6b4c65e7dc31a5402b6e139fb02/gupelugaduxaxebetalawagen.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/no5p5tc855p8epefnt5jtu66b0/44113055913.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e2a54421d---27797665061.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/j3lc6sf7fjnl8d4t71tupcf9hc/36165542648.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/moxinuxoselapesisa.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feeeec33f7---pororetawegapaxux.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/70ac9666be7af1caf5ca9f529340a951/rijotamelug.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160999fdd3a3bf---77144804877.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efae1e2251---jawepubuzufabijewugo.pdfIn PDF document text
    • https://argumentua.com/i/file/36950515052.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 4992 bytes
SHA-256: 92ed6df7ddd32b994162cf89cb37b9530b4b2d3ccb67c2ab4ede3baea0a60d41
font_01_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 5108 bytes
SHA-256: 8656db469ff601eb9acd18e76a6fc3e8c7dfbdeebeb10db94540c2bd5eb39095
font_02_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 11680 bytes
SHA-256: 05dd5d2f5ec67e7fea7113e22fd856cf7f827d636825ea58a240e0f7f87cd96c

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