Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdf24140593164e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-09 16:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ad943bad77d521c987c7e8d9da06c61 SHA-1: aeb09940fc569133ddf881b4873f71f4ce7a0152 SHA-256: 4fdf24140593164e6442409fead3c210c52ee99d0fb924c14946186ddcc30599
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, consistent with a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ou-ravda.com/ckfinder/userfiles/files/89518799455.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161318d036321b---xegawezinaganogozokafoze.pdfIn PDF document text
    • http://355353.ru/userfiles/file/pixatowovepomopofavigesi.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/dupanevu.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/8212209402.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161338632aa469---17885183502.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/671aa0e1a809618587652fb5c7a010e3.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/19453922726.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/xewen.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/8952374201.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/niguzezibamoxutarokux.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/loxofujifatasotilokufinu.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/turowibejules.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sevejosipatemugadi.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/lakixavijizo.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/kejifaruvolegiti.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/18011569895.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135d86719944---bolusilani.pdfIn PDF document text
    • http://teakdeck.pl/files/file/38520682967.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/50319811112.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/24042863060.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/68907516517.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/68421538390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+print+kindle+books+to+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_off0000b463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB463 15280 bytes
SHA-256: f839e57f376760e54aeccf3d692097ff3f2eca0fdd9cf6d50d9163828daa176f
font_01_sfnt_off0000da2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 10636 bytes
SHA-256: bca00a141e2c1f4c2b5e1f68cf5a4ae50c31b2235a3e40b4ec012c1d675bec81