Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38264fc53d60543…

MALICIOUS

PDF

108.4 KB Created: 2021-09-04 06:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cf5cf3fc7e48a548e36adecff7376c3 SHA-1: 703be6ccf70255a7e10dd3598a274622d77ecba5 SHA-256: f38264fc53d60543620a93211608a373eadb397c08d2bf3abaa95c7b4e51afd6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malicious content or engage in SEO poisoning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://fine-trading-knotwork.de/uploads/media/24486923334.pdf In PDF document text
    • http://chinawin-consult.com/userfiles/domawagetokegowonewumula.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/53186944711.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/9395189050.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210821105520.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d04a857e---sudaz.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/5730306903.pdfIn PDF document text
    • http://netflor.pl/upload/File/45343280420.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/vp3dqqts4bbr6pp6aeu9gb68cv/1886647991.pdfIn PDF document text
    • http://centrons.com/uploaded/file/950313787610ed9a72db43.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608893e363d19---mumaralerawunotepukalano.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/cgoiem4il2q41anh4man7t36b4/lukojujuma.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/70dc9a1e9446deed39e881531c01459f/29726735254.pdfIn PDF document text
    • https://tepihtrava.rs//files/97152480946.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/kegun.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a28ec314b9d---lupilomuzajozarobebunojet.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ldia6h9vd68tg4mqs12l6d48g5/lifitidu.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/30047472700.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/dozabudut.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9ea2aadutv043n5bc3631940k6/ruxakobaj.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/6jc20j3r51337hii4o7gl5f7fh/27278673685.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/zivopivoj.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0a545391a---69237995631.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210808191402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=heckscher+ohlin+theory+of+international+trade+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_off00013edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDC 10912 bytes
SHA-256: ec69e11e4f73f04d9e46af8c31006e32128a1cb358fefc641f58114b18a1065c
font_01_sfnt_off00015815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17027 19464 bytes
SHA-256: 3bb1c288f6fc884f35d863edec0c7d4b9fe35fa0b5f4735932dfbcc2a124704f