Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a033d4a538e54d2…

MALICIOUS

PDF

99.8 KB Created: 2021-07-14 00:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e6478c04be111cd2e2dcb9c0a74b3e31 SHA-1: 9e7a5565bc575e6da5f0bbd7ddf882d8ce660128 SHA-256: 7a033d4a538e54d292f9f462b02633faba7a014279eeb10538849680daf76d6a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs and the nature of the heuristics suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://ztkammer.at/uploads/file/sodepikebo.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da8900cf3f---24691519779.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/fjnkbmj0r2i3nbhih1bgvochg0/kivafofinuzivubonu.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/2d95e065a939a97ce8c7e0dd80452316/bovujegurotagupojakuzeve.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13dc3c563b---46088499027.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/82187558025.pdfIn PDF document text
    • http://mav-auto.ru/images/file/83898331513.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090fbd110bdf---77599887351.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/fv0ujq7ego9shkhgab0ir0gns0/90865229708.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pnr3k23mth03imtern1v4hbjdm/1608015158.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160807347a650c---gudenutizab.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/749d1591b1d45a42317075cc49ca17fa/43021263731.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/vukatorusiminuvewugosebi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb8d151d19---12517557865.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1fa651604d718dc1f221a5b3735e830d/87145977098.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/komalerira.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/26659662565.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4878dfab1c6c2e54b67da051ab7e181e/32692174691.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609483cfef6b3---wulevibapolitejajeku.pdfIn PDF document text
    • http://thegioioto.store/upload/files/dijete.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/17053363869.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11c96ebd1c---gesagud.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/jefojusokogipibig.pdfIn PDF document text
    • http://poorclarescork.ie/images/zijov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=first+time+love+is+mentioned+in+the+biblePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 2028 bytes
SHA-256: 3c3247882b5181b012272319048767ba8c18ca2405c674584a34d28e45de8df4
font_01_sfnt_off00012508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12508 10536 bytes
SHA-256: a482ff9f81de984498781cbd41731bcb7fa1d36e5a0cdbb0dd0b478e29cfc1a5
font_02_sfnt_off00013cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000154e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E0 16936 bytes
SHA-256: 60d89b2e3587b7a69d1ee0a6e5d3ab4069fa353011fed763bb521d420ae53f5f

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