Malicious PDF — malware analysis report

Static analysis result for SHA-256 140197d66f9243d5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 11:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a5a048f656728468bf29599450a693c4 SHA-1: c6d410e82466096ccd9bb28b6f72e92bc7664e71 SHA-256: 140197d66f9243d56620dbf34cf736f27ef346ec8e85a85f5dd8f5d8bc27b595
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://solelane.com/ckfinder/userfiles/files/17024789536.pdf In PDF document text
    • http://epoxidice.ro/mm/file/72400875660.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/89911796214.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/8845902293.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/rafirava.pdfIn PDF document text
    • http://airmon.hu/images/files/sanaxegolejetasemo.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/sufarategipi.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/zopavowixupuk.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ffddd519052236e410a0ebc1ada97765/23143552575.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/sonezatevafi.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/rafevaxadiranuguporela.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/44986517705.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/velotilet.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210626_2DB41723771D6E38.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a6e6bbaead3c0449faa6110c461d9b95/73341569793.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608244e13e7bf---34412795470.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609436d694bd8---56835669609.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3a76348464d0d7a9d7d4a4e2e4330fa1/sujukadelelegiletezem.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929b2d083b0---pilupiligusi.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/24479886426.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/90391295032.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/pogopelarojutejudop.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/7rpecvo04ssbj97i6207qc4h61/godegiwitu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/moqvm68el93hp5padt0qiioj1n/6719906848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=astronomy+today+8th+edition+pdf+chapter+2PDF 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_off0000c384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC384 17036 bytes
SHA-256: df5251782e81a0571536820a8c321ebd9c03f1bb762131d41a1a7c0459ff941b
font_01_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 11264 bytes
SHA-256: 57f159e9fbfec031fe56e5124998826c6b9e1337e8bec7ffda16a6189d888a21
font_02_sfnt_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1