Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f808bfaa0017e8…

MALICIOUS

PDF

83.5 KB Created: 2021-08-14 07:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 196fe5f5a245559f06ea922f54897be6 SHA-1: d00831ab9d6db2649d742e28e4fd8c49071b69e8 SHA-256: 72f808bfaa0017e8403f16eb71a1c9ef97344a26d1a01dec34d4c13ef389ef7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm with numerous external URIs, many hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://chronicles.ae/userfiles/files/dojisivubafefew.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f664e736c8---74447038187.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/lenitazag.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/kikonu.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/nalomezuxopowasixof.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/ginaxajosogerinemil.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b38a1b78d04998a3fe12d0edb4038033/1069483126.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27f93b730---guserejelilejitaxe.pdfIn PDF document text
    • http://emannsltd.com/userfiles/risudizelus.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/70279667118.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceb7c1cd7d---71724557929.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa30b519062---82936494651.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/79999214625.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/gquu28e73t5iuqmp99lehtme5p/94485323546.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16088d5679eabd---55613131336.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/82211584511.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/60ab94c38a20bb201edfaf30a2dd836e/96255561392.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/gagosu.pdfIn PDF document text
    • https://network-italia.com/file/22274249339.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/46424785438.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210809000256445426342.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/phublejobd0vfpg7vo10sq0m67/94695645598.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1783cfbbe11b383372ca8080bd931800/69736680746.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/ganikudufepapobidixagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=american+inside+out+evolution+beginner+workbook+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 11428 bytes
SHA-256: b098acf52bdc7645dabee9d66d5cefff37e18164f9734144c3fb0aeccb9621e1
font_02_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 18196 bytes
SHA-256: b66beb830c0f12bc8e7f1fbb0095e501ccf23740e810003713e83b35d5343f46

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