Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c5be66558c9ae1…

MALICIOUS

PDF

91.7 KB Created: 2021-08-04 01:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9c7f2661cdb5bf945485fe6fcf563d68 SHA-1: 7b66345a1534940915c6438663be3684bb012495 SHA-256: b9c5be66558c9ae1e671ef203321a982e484bfe69f302494bce87e47c7b46280
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs that appear to be part of a link farm, many hosted on compromised WordPress sites, suggesting an attempt to distribute phishing or malware. The presence of external URIs and link farm heuristics indicates a pattern of directing users to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://huntic.ru/uplcv?utm_term=free+download+halo+3+game+pc+full+version+for+windows+8 PDF link annotation
    • http://househouse.it/userfiles/files/tuwapujor.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2074ad9de269e0c7b8dc70656ef63b13/39911182764.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/92320747600.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1d39049e3---59739312058.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/tazunuvakegugoxop.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/figuwukusatuxunej.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/direjetumigamanaxidawaxu.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/91167995911.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/zisenakomubewudix.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vugiximagemup.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/17751919.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607715097bf04---gowupoxorokadodujidozezo.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/galoxafo.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/35006891744.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/1lrld3236n3k317d9s7lv6vp3c/24039394582.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/65116512674.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbea009bd0---wajejakufab.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/satakifepezizabiki.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd83b7c6a9---sedadokij.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/gulujalisososiwumen.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/14883272255.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sixewepuwoso.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/tometanotilomogisabimo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 17316 bytes
SHA-256: 0e835475af752b6878dbb10889a848d3f1a02450f277e31fb5481859f3066204
font_01_sfnt_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001453e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453E 11576 bytes
SHA-256: 326a0999c0507fa694e3c2e0ec00e8e72fd677b58ff171b02815a2618cd74132

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