Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe590afa89f1cc1e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-02 13:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7aaf94df45d8b184e75bdd78f7df8adf SHA-1: 37e29c9145023a9a877a49c8cde209816afff2c9 SHA-256: fe590afa89f1cc1efa04de8abca89d9cd8240a0986039a13612434d3d125f12f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. The presence of multiple compromised CMS upload links further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ventmetal.ru/userfiles/files/vubofanofututuxilorep.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/srhjms7v7m8r6iiirdou0egih5/90614068398.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c542b421a---32097796117.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/jatosunofemegegolekizem.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/81958920241.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c510530237f---tuvopekevovubajadagez.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/muxenabumunukoligomeda.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/55446342581.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ca3728921a13a322182bf6e080791e99/gubosezobaselibud.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/kakokurebovasiwipexarolut.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/fomose.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/21467375380.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/69801916077.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/wupibaj.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5f021858---60804955105.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d7fcd2db---tukowefuzaxobuwadezud.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611b2b290edff---lusitefavejinogerexoj.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e07657c6700cd93ec12b36c3444c782d/rejarutimelipomarege.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/zolenoxopex.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/rugafarofejazovejewuxuno.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1415cc51---soxasol.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/463ff4a54684c30dd90140ae371ce724/rupisaxibojim.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/88001625803.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/37138161993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pic16f877a+microcontroller+pin+description+pdfPDF link annotation
    • 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_off0000cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 11260 bytes
SHA-256: c4a564e3a7f417a9c3f56c3a23fc3bdac09f620ef0b6e01d0dbb56c81e4d1059
font_02_sfnt_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 18388 bytes
SHA-256: 24d3b765e5409f9cd523cb9c04b2af4f69e51cb6f57e9e7070eeeeb9af852ba6

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