Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f87b4934eba853…

MALICIOUS

PDF

91.0 KB Created: 2021-09-24 10:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82fa145633ed5120f1e2c745d1c727a3 SHA-1: 145e41c272305e8c35bee73c757fb65f2e2f1701 SHA-256: f0f87b4934eba853146c7bed96c7dd039eaded1f90c4a3381cb3c12a7cc9e20f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://mccartha-cobb.com/userfiles/files/19432459267.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/51296358474.pdf
    • http://siamsankyo.com/Uploads/file/gobuliwepogesetexobak.pdf
    • http://mrspk.com/ckfinder/userfiles/files/6982038471.pdf
    • http://seksdagen.nl/userfiles/file/jexekazikawojekefivun.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3cdd7b1a7004d3769f35776870eb0e5a/26715092135.pdf
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73787045666.pdf
    • http://4chan.ro/UserFiles/file/54017205673.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/78186130452.pdf
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/mowokilov.pdf
    • http://vnationwide.com/userfiles/files/94626449653.pdf
    • http://parikshitconstruction.com/uploads/tozetigawuz.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147946595ec4---88046712285.pdf
    • http://sahrugs.com/userfiles/file/fuditupozujesa.pdf
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/zabifoxonilibubisigapused.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/dbf20b11c8ab9b08f168ca5dcc76e018/bijibapelaxenawatafuwe.pdf
    • https://protrialse.eu/files/files/479323314.pdf
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/kuxurinugurubusukax.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b55e55f0d---14511359534.pdf
    • https://vwb.mrv-educationservices.com/content_file/files/sedetufokus.pdf
    • http://botosani.ro/img/uploads/file/fikitaz.pdf
    • http://uniroll.pl/user_images/file/labelikalijijo.pdf
    • http://bociany.sk/media/file/62460591070.pdf
    • https://rwd1.thadv.com/upload/files/xepegiroxorijov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=virtual+dj+2021+android
    • 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_off00010147.bin
58304aad2e6f06929741d201fe10866a5758f675e7ab53b8cd08face8629994f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 17428 bytes
font_01_sfnt_off00012e96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E96 16792 bytes
font_02_sfnt_off000146ad.bin
25799d4ce1a881483ee1fe567d61410dda44a53d27c0abfa13c3fa276b644563
pdf-font-stream PDF embedded font (sfnt) at offset 0x146AD 10436 bytes