Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df71ed34dfcab65…

MALICIOUS

PDF

85.9 KB Created: 2021-06-16 13:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acb4572d57ca97fc43dc4be1c47bef16 SHA-1: 741620883425b7a888c42e4da2918fc4b77adbb8 SHA-256: 3df71ed34dfcab65aca6f3e44da1a7d98d014be728861c95dde0adfb50e8b513
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=bangla+song+mp3+asif
    • http://myhomeinparis.com/userfiles/files/76624964982.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7077c7a95638e900c8bdbb54c6b13bc6/ruputaserumafaperukitaw.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/613124e95b5ca81b1855d2a224c5a6ab/3946874165.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/16a5f79cd0dee4c9e71247a9aff2494e/renokagizopuwul.pdf
    • http://gsmontaggi.it/userfiles/files/86416486333.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e573d8a3---pozebawob.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a15410ddb67---2559862122.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a816611fb60---16295889697.pdf
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/ab250216ec2aa2df1590117b4a94edeb/jakabafowumuwebebamutu.pdf
    • http://yilip.net/userData/board/file/39133658907.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1043e5fa8---9933927667.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/xawafek.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608790a35cccb---44424996159.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/479b582d8c5abd5cda90573bab2645ee/dineso.pdf
    • http://sosnovgeo.ru/userfiles/file/66305995542.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e982.bin
7dcbe01b010af117520927e4df050c7f4a0389a2082841d2f83920d3f77b752b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 5340 bytes
font_01_sfnt_off0000fba6.bin
d9a87d23680e916c9d67c3f83546d879a65489538e33b2440197ecb483d185f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 13428 bytes
font_02_sfnt_off000124db.bin
b65eeeb46df83f5ed1f6adceb7d279cdaf471910d6e7993719d3dcf8a0c61873
pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 10396 bytes