Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad508b5cbe85bd17…

MALICIOUS

PDF

91.5 KB Created: 2021-08-21 08:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81159ceeb71f0bb1f726b3738b5e1651 SHA-1: a94471740bbf73a8ccfd8df3a7460bad249cf445 SHA-256: ad508b5cbe85bd17b951c05eaeef7a01ddca1b9f3ebdabd43038a4491e4ec424
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which appear to be hosted on compromised websites or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier strongly indicates malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the heuristic findings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://ketchas.ru/uplcv?utm_term=wonderful+world+3+student%27s+book+pdf PDF link annotation
    • https://sentinels.ro/userfiles/file/padobadidetijenije.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/24c2195607e89be92aab5a673a09621a/67733186757.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nowebe.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/gikefosufo.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/41270921052.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kn4bscm5p2ree3krgutrfgfvng/janabavipipaxowunate.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092186b5f53e---gelog.pdfIn PDF document text
    • http://jp-cable.com/d/files/zikowusetam.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cfb6506fa---widapot.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e841a0b33e1---tovinojutufapoxeja.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/tewozodatonuwotagusugive.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73d05705df359ee3311d3cbfdee98e86/jujaxuvixugenukodewata.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67692df17---goranu.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/togoxa.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/20858f6c0d9c3f656154fcbfa327298a/58002518105.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/larojixezadogedefoxi.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/064884b0ef060c37d74625f02e426732/menozagoxijogutemoj.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/53791728979.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/54310532934.pdfIn PDF document text
    • http://sooclose.eu/upload/File/gufutubosomadivise.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/56891333716.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/usvbkpdknjf71ju1lcc0qtpuul/malexupexuvutoduj.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f3e27935---sevuwobexet.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0354925213---12385211208.pdfIn PDF document text
    • http://canvangdientu.com/images/file/tuliwetufasega.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_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 10852 bytes
SHA-256: 4ec929fc7514e7383b3a6899d91e934449d3ba2a8becb789897cdd9625b186a8
font_02_sfnt_off00013348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13348 16920 bytes
SHA-256: b1d6b9dc90ddf23cdb352c68d22322ef6cb55e35d9fd4a12dd3e94418c1b31b3

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