Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c5c1246993039d…

MALICIOUS

PDF

71.9 KB Created: 2021-05-25 03:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ec270eef3c521c91c3dedcbefa24668 SHA-1: 3e23d1cdec19c06fb3b184975b6aca5177b625a9 SHA-256: c7c5c1246993039d4ee172f1bbfc6319882d32fc55528b6a8097293cab828f3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to marriage biodata, aiming to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=sample+biodata+for+marriage+muslim+boy
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090444450f4f---vevubased.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5e3b89265---19759705126.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607732b0a101c---32295146954.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849ca1591fc---85435552334.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37b809915---rujav.pdf
    • https://acrgroup.nl/userfiles/file/4481495.pdf
    • https://heatingboiler.ca/fck_upload/file/jomutetevemojapeles.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8fe9cd55c---14914077356.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aafd2c13ea4---vazaxop.pdf
    • http://artospace.com/pics/file/mokedom.pdf
    • http://etcad.net/np/upfile/file/88541006209.pdf
    • https://aimhc.com/userfiles/file/bizulawiginaditinalowux.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f146f18918---mupuxam.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/0177149d72c1663926ecc5f8f7636adc/fetemu.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b36fb10b6---30465996475.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/cdb9aece0559cfe8359bb8c3911db3ab/pijojulusopedonuba.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/juzesitejiverolufug.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/113ee41520a2418d8102d888d6d2daa2/25770758867.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da96.bin
20ce618acae96b3fd1855fed34305c164dbd7ae62bd40394003b5b8f0f6c7988		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 5704 bytes
font_01_sfnt_off0000edec.bin
27cca80ec2e074d8378dccdbf9d1de38eea3fe26e9910206b3c72d1cec2a691a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 10100 bytes

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