Malicious PDF — malware analysis report

Static analysis result for SHA-256 901f40b2eb471f30…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 14:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4d043328cd5e3712e5a2db347155f8fd SHA-1: b927691844dc108f2cf0f316ce0b1ad9f0d6ecad SHA-256: 901f40b2eb471f30a9b446c899369ae29071098ba2174b59c6ba49c7fd95e776
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The ML classifier also strongly indicated maliciousness. The presence of these links suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/66654121102.pdf In PDF document text
    • http://studiodispirito.it/userfiles/file/dofubovidabodajasu.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/11460153310.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/59247034038.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/32646384070.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210921_0AD03354E23AAABE.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109231417112460.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/marizodaxoxurafi.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/28652288787.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/32e451fa448d7603cf6d89d995dcd50a/45983765803.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/nevolonodediterije.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/59934608123.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/viwoletulejelifewajekef.pdfIn PDF document text
    • http://futboltotal.net/images/files/wamopowalozuko.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/85265132639.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/77935446928.pdfIn PDF document text
    • http://iphysiology.ru/upload/xusupaxijexe.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/devugipumaxurejup.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/71047419380.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/kisuwogo.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/10b4473b9f4367dae738c88d2029800c/81206412628.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140858df29f0---61252539601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=apple+all+phone+price+in+bangladesh+2020PDF 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_off0000b010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB010 15476 bytes
SHA-256: b4b7a1f97c4ff3a96edb057eb11b13807447553929cb42547027d45a0f2f95df
font_01_sfnt_off0000d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 11056 bytes
SHA-256: b6586b8bd08f33b49c9339169d15fb4b7f115650d0fb6d37657c12d9db086ea5
font_02_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1