Malicious PDF — malware analysis report

Static analysis result for SHA-256 7218af6d56dddd13…

MALICIOUS

PDF

87.0 KB Created: 2021-08-12 06:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00189449ad0a69869af7548bc6c7059a SHA-1: ba81fa1e9a1f251d2b7f97626a6f3e0151576df8 SHA-256: 7218af6d56dddd1306d01fb8e1b93d73aad17af777e6ea5a17b3f095be5428e8
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress sites, likely serving as a redirector to phishing or malware download pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=how+to+make+a+car+air+freshener+tree PDF link annotation
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e473e2ba9---86727866.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/8c948a90c6296351fb6380f459218173/nevilelujexel.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c1d171aea---92964027040.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c64987de3c1210e512377c73dbc218ef/sapejafetibudijep.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b27fb708d8a---jurasapuj.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd164e6d8db---86364894785.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609030de01947---83626678201.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/sesirazoduwenoxuwonil.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/52253971176.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c28bd18d---xakaxu.pdfIn PDF document text
    • https://besteva.com/upload/files/gawuzifisunajelogi.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/38711962546.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/73236924320.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/e35j28nfauhe0oncis0qiaqvv0/78729590226.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/78101090000.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79f4e00a2---62317349130.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/nurevosavolomur.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a924eba1165---10777011553.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/denenibakubumulakaz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/826297f186c5567e350e57f304854d8b/38750086963.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/7eb2du0mqj67tjc51dvdf38vq0/43007741245.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/gazovureloro.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ddf5f52a4d7641130a2f8a69a62b774d/62436511393.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d7244fd8ae500669ef1b461b23e4a4f4/redexidetovazode.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607957f2c1231---71884174465.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/2mt2fsk1r2vnf51idtamdn8bv6/62797199093.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_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 10724 bytes
SHA-256: d26e85fbd9de4417aa9ee86ea5238514ca79925892312b763a3927225adcbbd4
font_01_sfnt_off00010a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A92 16664 bytes
SHA-256: 1652f201c3b9d8e3861177879eb59056141eba6f395b5e056014316e2355065b
font_02_sfnt_off00013603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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