Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded85e0291f5a189…

MALICIOUS

PDF

115.5 KB Created: 2021-06-25 20:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b96a78f9f69b5556eac4d9c18e0c1fb SHA-1: 1e4ab660582f0ee285f68a6dc517564f2ca853d7 SHA-256: ded85e0291f5a1897bc14db6d3314248f8236b7eaf7afca95b27aea79f3a9eba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm. These links likely serve to obscure the ultimate destination and potentially deliver a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/642f46b5061b82bf41f5fc8bafb4a40c/41464056160.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/00dea9616ed1bff4325417f4e1f43d94/fibabinigafi.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b66a2b7588a---87504116662.pdf
    • https://soalmatematik.com/userfiles/file/zovegaz.pdf
    • http://jgbt.us/pds/userfiles/files/24889153872.pdf
    • https://topinsolventa.ro/userfiles/file/xuderudedimarisa.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3859c121f490d6311cc50288918d3951/revudumugafidokugefiz.pdf
    • http://aliglobshop.com/userfiles/file/2360753734.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c79006dd76d---59820917201.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae1be19895---dipuloloma.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/v9g3s6t7p0rv98bedbol38c4ad/zuzarepoleneduxu.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8eef3a302---78116967546.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fepuriwidugefow.pdf
    • https://arerp.kr/data/file///pufakusaliw.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66dfc9527---76595105921.pdf
    • http://adabaskimerkezi.com/upload/file/44704587782.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c13d0b6e5f6---korotovobota.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/1027399385.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d93199d7---zararamig.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085806016fb6---95874031739.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f11a2da51---41896619798.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae34394238---76286570202.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=capable+of+being+persuaded
    • 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_off00016089.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16089 16792 bytes
font_01_sfnt_off000178a0.bin
8f52d53753bfe113bcf540e5de6fd7d09f91e76cd3366862008b59de89a784f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x178A0 10844 bytes
font_02_sfnt_off0001914b.bin
9dd05fbf7979f82a7baef4316ee1b232ae538ecfdb16e4efdc414507c2f5dcfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1914B 17784 bytes