Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f7504c47fd5d39…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 16:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f7074809ee97d15bdd2bdeae231d8783 SHA-1: a1a51cb8fc23eaf0ca0141aa9e6891c423419c7d SHA-256: 03f7504c47fd5d39912272f043f7c380e6161647d082e4f6702f95b67cd87bb5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious links. The heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1a69ec2fa24f8f50e6c6502269baf426/zifutugerapavogufekamuj.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075385c9c32d---xomuxatosubulaxigagesoke.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vrqh9lvs0npde2af9kria24v52/49440873286.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wufirogagiwelime.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/46767317077.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202108151033182213.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/93133095660.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/7c79320cfd8e0a08d89007c1c977a740/tiluzu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af665d3db7---madupofokidatamu.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/9097318836.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c34e78d3a---wisawakomo.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/zazotidaxekuwamoboka.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608189b38909d---rekajupuzavukux.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/65c10e62a6c84c8cb0d510b257927110/81215667765.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/nv6ptikvvsic3v0iokotj83611/silelab.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/70679488321.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/117q3v8o9pp5v0i4dirjo1o9fv/55803497458.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb7eb3bb7---69870892334.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607755b748126---13868345213.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/07be7abe94697eeea41fd380ba10e3e5/fugawuxubowo.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/voremibe.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/89057533176.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/66058973859.pdfIn PDF document text
    • http://thecuriosityshot.com/ruzetowikegex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=assistant+director+resume+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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 17612 bytes
SHA-256: cec9ad525899fccb3a6e70a9fa1fd9a294d4df40003a161299451287b72bdca4
font_02_sfnt_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 10816 bytes
SHA-256: 07659c4ce109a87827cb32356da3977dcecbd2451344e55900565aef97b6ed50

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