Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f75d3563b4bcefb…

MALICIOUS

PDF

78.5 KB Created: 2021-08-02 11:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0c2e307da2ea4348ecef4b4430296dd5 SHA-1: acddfc327a6cca25278dda7ff23e402a11f40ef7 SHA-256: 8f75d3563b4bcefb7bbd331c000375a1cba58102ed52953ac20648824c2184d2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/dikdcvudc6gfh39cmel5nmahh2/27462702441.pdf In PDF document text
    • http://ahkjt.com/upfile/file/jizaguseja.pdfIn PDF document text
    • https://kawanmto.net/contents//files/nujinasexetatixomomex.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/02tik9p30c4d6a1do9740pmfoq/11426832319.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/a1a79ca5196af50813991045f7a3548a/15094048361.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/gobekok.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a6c411af156a5655c9b4ebdae1cc2479/71089893883.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610737ef6acc8---61887766076.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608033bd05728---17790387383.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070805264743.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/90254935344.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16098e4699264b---wokorutararixivumarokon.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/139858598.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/030379fdd6c4dc30e8369fdc3b91e718/45178569050.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/23747211119.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af2047bdb83---sobabowofap.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a23677fa8---39454755096.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/92689534262.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/91403242525.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/fukapaxa.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/zolivoloxu.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/49862020739.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095033899fa8---ririvelotabeku.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/937f2b6657e64b3a7799c57adf21eaf6/bugesasigefivopopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=advanced+mechanics+of+materials+and+applied+elasticity+ugural+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_off0000cbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD8 16540 bytes
SHA-256: 1c7e186c596e69f4debfc0c307f4c1266f35028a58e12087fce1291ac50a92ea
font_01_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 11328 bytes
SHA-256: 20951728364fd76f04b28de6410f4613fad060fe530bcc3bfd21e8ef854c4b65
font_02_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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