Malicious PDF — malware analysis report

Static analysis result for SHA-256 926bfb241084cf7a…

MALICIOUS

PDF

73.1 KB Created: 2021-09-26 16:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed2d46e87478f56f307d3b2394fcd019 SHA-1: fa8c2ef597691c4f3179870c50e46de5c4610d42 SHA-256: 926bfb241084cf7a6cb02762945da6272db7b2c7d23a54f019d7bbc50694236c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, including one with a "utm_term=adobe+photoshop+cs5+crack+64+bit" parameter, strongly suggest a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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=adobe+photoshop+cs5+crack+64+bit PDF link annotation
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa3ac1c75---26154386294.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/50316700086.pdfIn PDF document text
    • http://dentherapia.hu/files/file/zakivekogapanoguwadiden.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/papavenux.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/46152009874.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109121657193236.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/41897746014.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b822001473473d7c0b82870d9cc203c/9338855879.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210914105702.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/8118676193.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/11808798041.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/fafofotirabit.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/62994785327.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/wajumibomazivij.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/44091493111.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/dekugomedatizivab.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/42795463362.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/zaromitebibakokojagun.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/94443793192.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/83357804541.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/21063441369.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/nobuworerexoninasubebaje.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77a374920---dubanomenu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140b333da0a5---3536066380.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614e01ce3fed0---78526944547.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614faf02de599---85855701903.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_off0000b902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB902 17140 bytes
SHA-256: 8cdf661f7dc44311850641125812eae7360e4ed0b7406a20f7770178891c6f63
font_01_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 11052 bytes
SHA-256: 4ce00993b0cb4d07e0fcae37eb069fd5cffb22d2a836b8213741093f0c585d85
font_02_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1