Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35c53ed30f0dc69…

MALICIOUS

PDF

95.8 KB Created: 2021-07-02 10:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2785781efb28762d25b97b5cbd7fb942 SHA-1: 01850bdf77d550047c0dedc57bdb98684da7c50e SHA-256: c35c53ed30f0dc69f5cd457ac5df954d199aaa9945dd1bd3d64066954b0c414d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the link farm behavior is a common tactic for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://medvor.ru/uplcv?utm_term=css+books+download PDF link annotation
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c2589dcba63f38aa61b831c59155ec34/10874990380.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160981ed0e0df9---38466026762.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/zisimamalumi.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b275cee5804---30356746317.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/677038544.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/lawitakevupobibolej.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/c1273dbc3a84b75332ae5b9ec95cd349/didigap.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c87de3e62e2---91246831758.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/25667972522.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c12d89fba---negalotowulelikafamovij.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/m1e38sgvt2cva959guensiekfe/1561761035.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/f9iv2i2bi9d7cbdlb28ak3fsg7/wivupaze.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/852162ae193463a017a19a157f166f32/sigepowuxuzeg.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609050acf2ab4---vulaketedawarametovewakoz.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084030ab31fe---jorewesatofawam.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/88b65031c245104f848997fc466ee88d/budekewajutijupibatim.pdfIn PDF document text
    • http://alkanboya.com/files/file///88189861139.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9b01f99d08a824991670b873d0e658d5/96220475672.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/jlojj891uucqp4cjnvola1uh91/14049845193.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a5ddc566---sulaweborajo.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/totisenutiderafutu.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/rifif.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/xazepovuzemutebunezefaxu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5e4f6c0d7---tufepofolepofut.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 17200 bytes
SHA-256: 024f5760685d7c472b484aa23ea5adfbc6e8d7fdc82d44b017da73d6122a71dd
font_01_sfnt_off0001222a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 1772 bytes
SHA-256: f35702912d2c0e6278341ee4b5627168268e01f7ae19b0696d4cd6a991b6aedb
font_02_sfnt_off00012a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6C 16376 bytes
SHA-256: 0b5448c6de0ed0f116d2c680d9cb6f47e90a51602807fce3603fd82f599d96d4
font_03_sfnt_off00014061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14061 10168 bytes
SHA-256: f9932a427f4db45271dd59ab568c08607830397b58caec97021d43d825b5c4ca
font_04_sfnt_off00015757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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