Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d833af6e49c728…

MALICIOUS

PDF

179.6 KB Created: 2021-06-08 18:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a3ba64b9fab1d2eb6590ef935d9c8dc7 SHA-1: 8f94d46bdf1943a223ce97f7400e0b8e5a11a33f SHA-256: a6d833af6e49c7281f0223e9fb0ea1ee811bb69027161de2f6f34be76ddcfad5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the hypothesis that this document is designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3142

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://cructi.ru/uplcv?utm_term=blue+check+mark+tiktok+copy+and+paste PDF link annotation
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c344f64dd00cdad195d1cf7b584f8358/fozixuwivip.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4f1fa13a7---datamadoxogaxuzesugubax.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe8c13031f---37381713405.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4d191d8a---binogafetakasojobawot.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6a5c811f2---laborenolugeteb.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/o4e3jk0qdotn0lisrobjqrqc0b/dazasux.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b0ffdfe31923ff69692d42f4ad4db1b9/torixajokezigajekogexoma.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/nakimavokanule.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077255460f4a---65293527197.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/or94jn7h7pf8lm9kghtvavms63/vomizevusibus.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/13ff84c645aa3a90708c1665ece7807f/19983485429.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69f8f42b76---55544627437.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b08180f0e6---76174390515.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/acb1df5c474926f1d5d7c24d91c4b484/sexukobalibifevela.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080309ae4a60---feximura.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c875f405f6b5aff829db569fad60c214/29740790973.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/dinesuranakume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BF3 12496 bytes
SHA-256: 354cbd651d0709920ced62447cd6cf220a425a2cf1d9d01a49db594b276cb1d2
font_01_sfnt_off0001be9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE9A 4468 bytes
SHA-256: 66b47656500971a97467136ac2b637fb6ba6e07573e4c06face0010ce99a44a1
font_02_sfnt_off0001cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDC3 5528 bytes
SHA-256: 7a5434831c06d4721c297ac59d325e3bf9aeef6cc090447b5d2050221b3b023c
font_03_sfnt_off0001e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E027 8464 bytes
SHA-256: 051c9d79b747efd9b3099b03761bffa53ea14545c2102e6a3377bca32f97806c
font_04_sfnt_off0001f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F61E 38456 bytes
SHA-256: 6044f3884f5876e35f7ad76f7b2d47c8d4a986208a8284d8db49a75f9dfc5e0e
font_05_sfnt_off00026751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26751 21728 bytes
SHA-256: 8e84c354219768e90b40e971b357c59c11d3f0d1f1c56a3d5709ade6c40e853a

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