Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c4bf6a1535dd21…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 09:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 590aa4bcdc13edfa94031a15a1463f63 SHA-1: c007de32a9b5da31c4b77d47c7912d655549168c SHA-256: 91c4bf6a1535dd21c18ccf7255e54efeeb464560684a54453bbf071c343606da
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://lrdreamteam.com/files/files/file/InfoProduct/file/18560426275.pdf In PDF document text
    • http://pensionpoint.cz/userfiles/files/lafaxugirirupulo.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e743ec5ea---boxanerutifu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/68352a7a62b18659fe3ba15e7850d3d3/69692028093.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/nalurasovumabeliwivu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871d56767d3---nabokivuwigowu.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/berekagodiliwadideva.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/bibode.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/setokozewam.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/dadf0f894d6563ee9cfe8a0c8d97f1df/41754479480.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/mojetejirejesoxikebo.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/3s00rbca5glknimac1m7h03av8/48425021725.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/a4da5b3c6aa73e8a4adf95308f0e3bab/20423593666.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/52487550315.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/72622598154.pdfIn PDF document text
    • https://isosklo.cz./uploads/76737463227.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/pulokotutonexosigilubo.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/6e2815fb25477a16185b25df32b038ea/pifojuboxukevariko.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/fazosipexolagevaj.pdfIn PDF document text
    • http://jucal.es/images/file/25072953828.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a1609b13cce---80982102464.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/34212406119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+irish+crochet+patterns+pdfPDF link annotation
    • 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_off0000cf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 10648 bytes
SHA-256: d147c31fdd06ce96de75ad2c7ec67732c7bc49e8cd1579dc5456f320785dd176
font_02_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 17240 bytes
SHA-256: b8abc3397e183d3d7e81137b72512aae6dd98282d9112d5e34553dc0ac194330

Open this report in the interactive analyzer, or submit your own file for analysis.