Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8892a80ec132fa6…

MALICIOUS

PDF

77.5 KB Created: 2021-09-11 17:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3df809f088f239b01a9de6a513079124 SHA-1: 366b091dd942f0a6f4a9a224752ce1fa95a71f93 SHA-256: c8892a80ec132fa624af8028928482701d2f28d3690cb6c35952ad16c9ed6bc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the presence of external URIs and links to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure points to a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=bluetooth+hci+snoop+log+means PDF link annotation
    • https://palcev.ru/userfiles/file/numalutame.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/44047382168.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/53481030907.pdfIn PDF document text
    • http://jn-zhsc.com/upload/lotaxi.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/xukivevojupidepuj.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/zaxezaxare.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/luseduwux.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/78905361430.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7dse1drn8nb6rlp04p9597q57r/fejafazexogabexepapa.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613961645388a---koxoxamuwotumadesifopoji.pdfIn PDF document text
    • http://ergakiland.ru/files/files/satajososezizeregel.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132b559d2b1a---larorakus.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/52b509d9de8de5ad23769f82d1a81a3f/guvasur.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/40047666841.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e7fd541b---62775222790.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/fadetakuzovi.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/16479956663.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/31763567872.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/melexi.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/faparovi.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/tonijuxuwowaza.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/93284265818.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/kamilibib.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/guwafabogex.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/44967735600.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_off0000cb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB74 10872 bytes
SHA-256: fd0516c49f6339045981abf7e0856b75416fa960f6f6fa2dfa7914cbd990f4ca
font_01_sfnt_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 17096 bytes
SHA-256: 47f1db09ec99f4d1ae3a83cfe8da6210df837999bab6a85a6a809a25a2781188

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