Malicious PDF — malware analysis report

Static analysis result for SHA-256 9572d9be220249ba…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 13:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47c9dfa9b398c57f2945daff207acf6d SHA-1: 6d0aee74ef97f3eaa04a095769b60dffee2b09b5 SHA-256: 9572d9be220249ba7d1a17061c64cbe209e5dca620db5d189374535f77c16c6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=regular+plural+nouns+worksheet PDF link annotation
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/634a835b1e77d5a465e00c79fed028e2/pezopabawarot.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/93383288640.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/wixuk.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/laxafezejosarivixejegifa.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/juvasudatobolegoposedudax.pdfIn PDF document text
    • http://kahasat.cz/data/file/64809788285.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/9734784725.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/ranawo.pdfIn PDF document text
    • https://aildf.in/userfiles/file/90329431232.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/59615628201.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/86540441923.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/basewujomotim.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/14108336785.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/vamefebuxaxax.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/zulitin.pdfIn PDF document text
    • http://eichler-kammerer.de/wisofaxepujokuv.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4e9a2d67b6b65248fd76ff7e08aff258/80167352298.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/76255779028.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/59588558788.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/2889872659.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/pakidebokonixa.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/93563839588.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/tobobutiboxo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490c4ca2128---91667644869.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/nodaditisiraxenogod.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_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 10760 bytes
SHA-256: d337943e3be80f2ec8f0e0bb6d176442484cd2876cd4f737b215d93f502c3415
font_02_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 17732 bytes
SHA-256: 16f0c489e34d1a1688ddc3e6b3c6d75e655a312e1c7883ee339fbb40cae1b321

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