Malicious PDF — malware analysis report

Static analysis result for SHA-256 21700837da61ad96…

MALICIOUS

PDF

73.1 KB Created: 2021-06-30 20:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bee0aa4ecac9bcb63b558c4ad1355bec SHA-1: 4c5905b3467a66800a87cf54f112de143c00d1f6 SHA-256: 21700837da61ad96fb4cea19e6bf97d720de6869b81868394c0a1fd9e12b0b31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tfd7h79oei1buad6b84otrfal3/fozorum.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b86971ec4eb8411b690288a2fac66c6/jexudaxagejot.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ac83650ef47d67d6d86934b02e30bf55/90818969259.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/19404154437.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/672ddd785b692cd71a8df1f1b641dbf8/tepejesurujojuzupupi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7f03d6916c1c4c0df38232e236b58f6c/51039672049.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/95817687819.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210531021813_440820902.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/87269424529.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/656b0630603b47e41cba14eee52f923f/47772596800.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8bf47f2161159be918884c6d129cc1d0/38919566091.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada45a89ba6---23699292353.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c4256bdd65d83e72d6076cafa5f6dc55/59312213449.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a34226b6b30---80222172379.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/49f302e500859da8ff881322a1d109bd/fodekila.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/58392827958.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/womefitixow.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16078b78f30ffe---63461619006.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/11a98097c1a3ca63e18ba6d9d57f7e11/70650296156.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aee4bca114---vomudizezojevoxexus.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/89145143997.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/danukejobopujal.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7c74c760a7b095d82addb10dddfe8f56/33212039977.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ub8vs8n9pbl9m8i33rslrlj344/kutisavadesimuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=b+town+kitchen+and+raw+barPDF link annotation
    • 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_off0000bba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA4 16700 bytes
SHA-256: 2e7a45014e531139dbc2c6a36c72b0bc67409c0f68d476a6e7d865889de34c3f
font_01_sfnt_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 10624 bytes
SHA-256: 8ca64d3e3560078747d3b7dd6f1c65ad75293901c4c328e9fcca350a068def25
font_02_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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