Malicious PDF — malware analysis report

Static analysis result for SHA-256 e105f13836eb1117…

MALICIOUS

PDF

82.4 KB Created: 2021-08-23 17:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7749f6d028174c091a15ddad476c8f2e SHA-1: 25506cf93d57cce8edb7e50366da8667a05de4c2 SHA-256: e105f13836eb11176e35ede20e25c0ae9aae4fd2ef872d3dbe653397fba0c1ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=air+quality+in+my+area PDF link annotation
    • http://kyanite.tv/userfiles/file/86551275563.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c3969a680---sugomaliz.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf848278fdc---87768615558.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/ziwakusimixas.pdfIn PDF document text
    • https://noddy.nu/images/file/9779079829.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/98913918003.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d458b9bca25---54929140319.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/kijurajizagofej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b601bd0dfcd---ramujemuxebixot.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/45981719011.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/tejuvupe.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a0fd52bae5f9d7dec070207936b97be6/48537285705.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717085822d7---17548153927.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/litifumuniwefigup.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/3269387582.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/garede.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/75399155614.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a84015ea978---49058975450.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e2e3153529---65479473591.pdfIn PDF document text
    • http://denge.aero/upload/files/25314041401.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/10117086032.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/2qgki3csmgrrgk6scgfhldknnr/92111177447.pdfIn PDF document text
    • 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_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 10324 bytes
SHA-256: fe763e36fae987eb0bcdecf6f767d349fe56b9864c8b0a0d1641f1e11963792e
font_01_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 16744 bytes
SHA-256: 16a5555d5fd94f544f4f7501f628966c05bc4a734af0bc4e2ca4db575c53417a
font_02_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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