Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80b4806977a8a14…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 18:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 497c6ff6f242155ad38e6e10417e8d21 SHA-1: 2c7c6963b6eed95992e8f23b1c9979a5332b9016 SHA-256: f80b4806977a8a14e767f58d70caf6503e3cd310065887da8b9f59a2c289b058
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on potentially compromised websites, indicating a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external links and the nature of the hosting suggest an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vanrun-it.nl/userfiles/files/zaginubuvofowameledasapiz.pdf
    • http://vimbark.sk/editor_uploads/files/kuvowuxip.pdf
    • http://banquat.com/userfiles/files/xavemobizizizujebinola.pdf
    • http://huthamcauquanggiap.com/upload/files/24137532820.pdf
    • https://amoslodge10.org/ckfinder/userfiles/files/70211604412.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16143622fe0e42---50324294698.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16b205236---16347619687.pdf
    • https://pjkconstruction.ca/images/file/55963011398.pdf
    • http://hnht-electromagnet.com/d/files/bibifeseliwofolubejok.pdf
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/xapudojilezejujevam.pdf
    • http://ct-tci.com/cttax/userfiles/files/witewusafimawojirasibafit.pdf
    • https://oancora.com/ckfinder/files/9247362628.pdf
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/51513198535.pdf
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/gupemumizujovuzebigot.pdf
    • http://bbhshipyard.com/userfiles/file/36184870073.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/37643250539.pdf
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/zemunowefudizuruwopub.pdf
    • https://greenbins.ca/ckfinder/userfiles/files/vadaxebezusudatun.pdf
    • http://galantemontagnana.it/ckfinder/userfiles/files/vapewitunomorikulu.pdf
    • http://hotelgiottotorino.com/userfiles/files/29968123610.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/58947339515.pdf
    • https://twinscooking.nl/twins/userfiles/file/60368675640.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130909f5d155---kufesul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cars+1+full+movie+in+english
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9c0.bin
0a733c9c3349970393296be261e9e1b8f3c5d4676dda297019fe20e9503b686f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 10812 bytes
font_01_sfnt_off0000f28f.bin
f6275570a03f807d3c6df7721102f94a0319fae544b5f69c22130dc078cf32c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 17952 bytes
font_02_sfnt_off00012099.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12099 16792 bytes