Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f910c572624abf7…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 01:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dcbae9c49cd1136110a4e2bb8a2ce2b SHA-1: f34fc369119b616cf3b22531d3564cde214008cd SHA-256: 0f910c572624abf71fbd93d2cb4ce5ad417fa6044f8c332e6251a78ae8d1388b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These links likely serve to redirect users to malicious or phishing content, consistent with a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=nice+words+that+begin+with+l PDF link annotation
    • http://kochamsushi.pl/UserFiles/file/pudapavomulozupovel.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/dagixuroxetu.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/sujenimapokuzonovurev.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/86a58068e9b9343b320761e421617048/81462344857.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/30145424302.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce69314012ca803b5d19bb45168fed07/muven.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161331f05102f0---62679932182.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469858cb15f---93265710153.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/ferat.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/tufawadenijinoz.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/tesavesimobekazof.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/42551759694.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/xevufufeperetofolew.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/98334879860.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/915785817.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/lodaranenesanowi.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/tululefo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161419a975b69b---85027232273.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/61560434852.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/37811612494.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/43227700269.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161442b13edf00---figugigu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9e7c38735---diguvuwepixofifadefa.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/peganezokuzuruzutoda.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/vadodigetuxa.pdfIn PDF document text
    • http://alltechsro.cz/files/38005918179.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/fukivoji.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_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 10852 bytes
SHA-256: 972ba8a1282aa39d3bf6e7286cb2f26795fb4e51c6689d22297960fe33f7802a
font_02_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 17408 bytes
SHA-256: 08b446fed955054f9f867813ac7bc04e76a2d32f0a2d29fee111a32ff516e625

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