Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca51f549454e4430…

MALICIOUS

PDF

95.0 KB Created: 2021-08-12 03:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8fd75cd40c97b2ad001ed6412419c7f SHA-1: 73ab54473a05e9bfb8327226f2208d4607948720 SHA-256: ca51f549454e44308825eb5650146c34799869d81479fd1bf94070adc46b5a61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=a+streetcar+named+desire+scene+1+stage+directions+analysis
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/66fb61f68c876fd7650b057f382d6eb5/sanifelew.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e070219a9---90491599998.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1c84e2460058506c3ebf980ebdb17391/sigibavabifidi.pdf
    • https://cahayaapi1.com/contents//files/94326369582.pdf
    • http://watthaistuttgart.de/userfiles/file/89209856860.pdf
    • http://agarimo.com/archivos/archivos/10155400499.pdf
    • http://atenngo.com/admin/sites/site/documents/26435356868.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e237e7b7d---22301159137.pdf
    • https://rockyhotelsgroup.com/uploaded/files/63764882297.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21arcr81j130dej78dnie94ni7/57056941145.pdf
    • http://shuswapladystriders.ca/userfiles/file/xedakafagikupajedul.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d0d7bf614278be53eea36746f3503276/lorefowekereduzuwisif.pdf
    • https://cncunse.com/d/files/dazotavakegivopoja.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6034cbb732b32fb7185025b1f2c74f3a/litojusedupujozo.pdf
    • http://aedelsur.com/contenido/files/88597503283.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608223753ad83---mizugu.pdf
    • http://somogroup.vn/ckfinder/userfiles/files/77906077854.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607459b197f06---53105109892.pdf
    • http://cbcom.eu/ressource/site-image/files/12818317828.pdf
    • http://wo-kop.pl/userfiles/file/limitu.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/91a14b8a8e7614d78c2d1b2250112a2d/56735976109.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3be1650fb67354a68f4b0659cdbe941c/dogoredalanenudevasamiv.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210612190509.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6920c1e38---37251786875.pdf
    • http://dakmet.pl/upload/ledufonadejuxulijug.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/1165375442.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_off00010bbd.bin
c686ee5dd3506443dedf9d401530636ffd72c3fee3be7ef539fd23b5b73b02fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 10860 bytes
font_01_sfnt_off000124b4.bin
3898192fdeb7ea07b2466b14beafd391abb301bd4b5afda5495c58d8ec7a14e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B4 19176 bytes
font_02_sfnt_off00015593.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15593 16792 bytes