Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0bb050588e1c01…

MALICIOUS

PDF

89.1 KB Created: 2021-07-22 07:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbf9a61e54cc70b226ead254987876bc SHA-1: 8ff6f7c624c0e1208ab5d49f4724c9d2f4f732a7 SHA-256: fe0bb050588e1c015bf64c376aef54650ec0a4f01d83fdcca0bb37eb074c176d
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites that host further PDF files. This suggests a multi-stage attack designed to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae90eac31fc---97872808046.pdf In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9f09629e---87820519446.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/054ab567715814022c0fce0729aca70c/11911910061.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c1bf732468dc33910aa94ede6d1ef9bd/4033364761.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/fmefmfhhgmfk2vlaj3rod3h6eo/98277383345.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/242b99d841b60293ac4ab36ac9137ffa/943645483.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/130b4b20dbf583125a2cc2409b7134d1/52707128390.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf338a559---79192918441.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/99625885436.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/7a9ca3b3f4364b91ddcb649d4a811946/rigomixegefiku.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0ecc846bdef897ae5943bae12f7a0337/tufogodekedeviwopajefeg.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608777cee50d6---nilisiwusok.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46ab9e2aa---39438551681.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/89b7c2985e066a8625a251623a9d76f1/11788977896.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/sexazatevesafidex.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/rotikukigunupurodiguwune.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/jovekebisekulaxu.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/17545343895.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/45932fb30c45cb9f819b486a0fd3c48d/sinigenivud.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/geguzupovofomosa.pdfIn PDF document text
    • https://123natura.com/stockages/files/judif.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2063927237---847047008.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af1947a287---58293548459.pdfIn PDF document text
    • https://hoalavender.net/upload/files/zozekepulug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bank+overdraft+meaning+in+englishPDF 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_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 11012 bytes
SHA-256: c88f6c7dbb7f2be5f2e567a1c019a19bc57d774518ff6e73510c76147144b847
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 17684 bytes
SHA-256: 14aad4e2d84d877702eb0a36b7e6263237cc0c93010907405b29ced510d8c47a

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