Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ca8b824681ea61…

MALICIOUS

PDF

109.8 KB Created: 2021-07-14 00:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 11dad4c970ecf13023524966c5765e69 SHA-1: 6d0cda529cee22adb208ab61253be12719567917 SHA-256: c9ca8b824681ea618777429d29efefd6f385d1b9dde31d47c3fe64e9ca8913a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute malware or conduct phishing attacks, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a7050dbd27d70803bbe5e4e225ec538d/jowavegovoni.pdf In PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1de483cce---98416817737.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1623910590jizofekufo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08930545e---pivijodijukajiziwekubusol.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/bixofezudawinijole.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/xiwuxut.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/77011516689.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e0ed6819---32821343455.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/17384481229.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/kta0b5ggb4h32boga5nnp2ucd2/nekobeparefixotis.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kasosetobuduzoxudigu.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/3vp0d27e9n5mibpke9ku4e60bj/70385260045.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f5c73c807---48146288160.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/8be6904ed32230d64bfc64ce35ed7d5d/58952316001.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/39a993a83e883cf15823131fe074c2a1/31614136657.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/dtq6kda27so68vc6dgos23d5u9/39312768374.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/t6afm6t4g2g0e4s9rlf7daca02/24644805581.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb03867b1b---4243613304.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae004344a---33212771430.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/21556103940.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6c7848e0---46505133763.pdfIn PDF document text
    • https://slide-bearing.com/d/files/54671428743.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c52c8167940---49686245850.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/qgu7llr6ruoieubnm1dq0vlpti/vetawodemazuxunido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=notice+by+landlord+to+tenant+to+vacate+propertyPDF 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_off00014c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16442 10636 bytes
SHA-256: befe46fd9b9a14b5fc49fbba1842afa1073c15511cbf99f6815abb782f91ffd5
font_02_sfnt_off00017c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C87 17184 bytes
SHA-256: ba7addea8b7f171589194cbbfcdf8f9bb81aa0423bbb844e1e678f1f41ee6b1e

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