Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e99e1c3d426892…

MALICIOUS

PDF

78.4 KB Created: 2021-09-08 01:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9fce42c13d03149ba9b23349f2ed1ad SHA-1: 5c87a5bab1f20e68aa6b994c13de190be2101a29 SHA-256: 57e99e1c3d42689297e6716d574ced4f43e593f0d4e8e93465fe5e67c635f675
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=spectrum+math+workbook+grade+1+pdf PDF link annotation
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d545df53a45970dbf5376a0b590c5012/safopos.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5ae75957d---18170054707.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5bcb42e57---tidunujugazipixuxuk.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9ea229b0---xapivow.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e085e3d73d7---13434200700.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/l2i86pdq1aslq31l0885jb6eq0/31645738899.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/mawivadiwepabofadirafi.pdfIn PDF document text
    • http://mega.kz/media/upload/files/64447457515.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608704e951498---jujonunokepasijifenida.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/10123915806.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/89050519226.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad759dac58---57743910730.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103767349a09---69238007708.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/mipexuzirawixagab.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f98a1522d6b4a7e9fcb54294fa8a590a/52337896132.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f54af6444aa---51745032635.pdfIn PDF document text
    • http://gchs1966.com/clients/2/2f/2f663f305105093038a7fc4b193dd8f8/File/27007145562.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/13415809710.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/jasifopubovogukovi.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/xoneveg.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/jugevi.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_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 11204 bytes
SHA-256: 1b33b22361ef078efdf24e0b3f7bced5ed5992d7b108e1288b9bf6dec8ddbb8e
font_02_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 17464 bytes
SHA-256: 307eb0685c8327986e5e179b3ed87912634dd48ee5a36b7f15e5a21b8f5ab5cd

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