Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11a68096e71267c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 08:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cdac67e83337b775ba981224ee6564a6 SHA-1: cff474bd536a018934835e267c9d4ad80204c708 SHA-256: b11a68096e71267c53e832f19a68945d9577f47547389edabadc5c808972c0f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and numerous external URIs, many of which are identified as part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=soorarai+pottru+yts PDF link annotation
    • http://dental-forum.ru/userfiles/file/34345522112.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/nijopugerenenodedobabinef.pdfIn PDF document text
    • http://lgassociates.in/uploads/34789015171.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/38d619d8c906746c6180f159a3dabeeb/83851857296.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210903080847.pdfIn PDF document text
    • https://31app.com/userfiles/file/96380313420.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/82048792369.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/8in8irdsmai7qnsqmnnl4m9j2u/28029602508.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/27301632815.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5e939906d---68663286626.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/2703541252.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/50786295595.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/pitonujokab.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b8a65713e923aaa0cff0e4fd11ba8c00/25317753703.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/terujofev.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/jipijigizeserapipolerev.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/93997074902.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/fapapawije.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///35345080779.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/91848753575.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613C2B5474695.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/dokuxula.pdfIn PDF document text
    • http://didopack.com/files/wudoguvesom.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/96439395952.pdfIn PDF document text
    • 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_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 10252 bytes
SHA-256: 4fecc60989003ffdbb38e752cae1e2672b17959a87d4f8e4816ad0e5e0a66d9c
font_01_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 18728 bytes
SHA-256: 572b1f5998b544fe37515187dd0763ca3839eb806ac232edb279ee32976ade88
font_02_sfnt_off00011d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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