Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0330b1e71c32c3d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-03 13:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f483bacf1f704cc0977567471ca0f21 SHA-1: 3ead91f76c851b379f3eff24ba5474bf5534cd77 SHA-256: d0330b1e71c32c3d0893bdaf1f3dccf243b1b932a75b406aa1ba9e91d2eec40d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution intent. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4504

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://nomylo.ru/uplcv?utm_term=manipur+census+2011+pdf PDF link annotation
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/20ee7711971852bf9078befcc1027fbc/duwepiwesesa.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0b013f76b7bd57afc208544dcd8550e/gibuwununugepobejelet.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/kamem.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/39738767933.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5e3039702e8264e7b03d8796bdcbcdda/dizudijilirimoxofarikev.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c557361252---gisosawukojobupe.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/kelurofinuvupegu.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/imqdmvj6q4skshuiu402o2cq1k/82759365946.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa7fd1267---70486782668.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8625a8676cd09cccabd7f8bde8c57a71/tubakojumitadovegip.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4073c2b8---safubebugowijitozikujored.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/bazakubodo.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/p8leo7iv6h3fklni1lknhhadaf/85058045441.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/movesapo.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/bujizigififup.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7pgbrnn6ckfohbbulrukov26i6/96172045931.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607260da91b15---23449426297.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bba791af9b2---84440795030.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ros5b8ggtcba1ubfs4u0fsm5oh/76149336568.pdfIn PDF document text
    • http://djapm.com/userfiles/file/59398200357.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e348afde74c---76272088874.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c182b28ca---xunuxebori.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/35318671960.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/34610177523.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/451dbfdee28c4585537db5d64cdb01fb/57662990389.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l4d6brs47pbf75kmdh4phcaca0/50258984411.pdfIn 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_off0000c148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC148 10736 bytes
SHA-256: 0f83c7f90184728d647540396c5abf7da870e238536ba87ea99fd214fdee1ef3
font_01_sfnt_off0000da24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 18516 bytes
SHA-256: e18ec115fd4f4446397b02ac9dad4c6f49854f46df153f6351c6331dfc71e7d5

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