Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e64c436987a4fb2…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 23:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c1729e4ced08c1c6e62ee785d1fae29 SHA-1: 6af7cc6b2fe425ad7400af0ec63bf7cac03f2783 SHA-256: 2e64c436987a4fb2a1458f40c0605e5085a214cec6c8b7f6a2ffa710b23ee7be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs, many hosted on compromised CMS uploads or disposable domains, indicates a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and the associated URLs suggest it is likely part of a phishing campaign or serves as a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=infrared+spectrophotometer+pdf PDF link annotation
    • http://www.agenbenangbandung.net/file/lobadomulagok.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/nigebelofapana.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gtp0464jjd0tr0m701agrju5t7/74202264013.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/89076717667.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d0293b3e---kabogeli.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/69133675961.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080be54cfb2f---73079251380.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-23/20210823182934355829.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e13d668ea8---wizufokopimafaboxivirepi.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f252a6ad5c9c4db240a8ed63691ebf4b/zirafumaxovusetaxa.pdfIn PDF document text
    • http://954move.com/clients/4890/File/31709195177.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6176f2ed23b42014f7b4bee1ce118974/4275135579.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4aec713b7---81311734641.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/2750016102.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/xajavidunal.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/jonawaliwozovizuzofijuje.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ej0knpp8comnemjr65qr9pgko2/42064054335.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/10472071952.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0nfv2qdm3b6ihp9b5uel9qh9tl/70034863721.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fb9637ec0---samebilugu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a728bd08be7---fepaz.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/afb8716928bb171532dfaaf0fe1d2ad7/nadure.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210527232947.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/16861614929.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_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 18596 bytes
SHA-256: e9d570a67758f660199e4bd0d4d90a00eb673aa7c1a4cd633008423edfe491b6
font_01_sfnt_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8E 10700 bytes
SHA-256: 11a203bf844a27f577a07ec156893ed21911b924bd6c4c62e9ad70c3252de732

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