Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca926bd71d62d2d9…

MALICIOUS

PDF

73.7 KB Created: 2021-09-25 10:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b557ef52e40cb48596c058517eff6e8c SHA-1: 9018fcf840b680d4c9bad2091f88cf5a5f1e2e6b SHA-256: ca926bd71d62d2d9fec5dd6d676958448d6c386760e504804cb3771c7a3a7f65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious or phishing sites. The presence of embedded URLs and the overall structure indicate an attempt to lure users away from the document, likely for credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pixomot.ru/uplcv?utm_term=android+under+7
    • https://egokituz.eus/files/galeria/files/91565501535.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161399c6b9abb8---mujezugubitajovoliboj.pdf
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/4187195845.pdf
    • http://paliukenas.lt/i/File/4202638256.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327c03aa55a---47998979032.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/90fc893d05b6c321150c84768e63e9ff/32475439230.pdf
    • http://cross-winds.in/upload/contents/images/images/46050214911.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/du852kpu7s92ir5jj4qhuojam4/xavesi.pdf
    • https://neksav.com/upload/ckfinder/files/90076060013.pdf
    • http://vangphutai.com/images/uploads/files/36133920112.pdf
    • http://mannadey.in/FCKeditor/file/bumapapamobuwinorobavi.pdf
    • http://aedelsur.com/contenido/files/70956466635.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614581609b098---tilejinata.pdf
    • https://mmeasar.com/mmeasarfiles/file/51774266755.pdf
    • http://yossy.biz/userfiles/file/fidunuvirinotuwuroru.pdf
    • http://huynhgiabaohotel.com/uploads/FCK/file/8159026520.pdf
    • http://xn--oy2b9bv81anouola.com/upload/file/202109040000130893.pdf
    • http://veronikavilla.hu/userfiles/file/66780137362.pdf
    • http://cerezolorente.com/files/cerezolorente/_repo/file/69075879196.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138129a89151---48009850115.pdf
    • http://foto-klub.dk/userfiles/file/80741799872.pdf
    • 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_off0000b758.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB758 16792 bytes
font_01_sfnt_off0000cf6a.bin
0ec2c4652a432c801433cf2fe2f98320a63e76ac627dfebcebe511f7a6884a6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 20076 bytes
font_02_sfnt_off000103ba.bin
588388f17bee49630633d520dd813c2b9249847e37ebadca702dd49b4c4bf8e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 9896 bytes