Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f1c69377dcd4c6…

MALICIOUS

PDF

88.1 KB Created: 2021-07-29 17:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d61ec3ffbed65af312b99f7c4b849f28 SHA-1: e52dbe02e9055e19fac034947990ac3ec4dd1cba SHA-256: 91f1c69377dcd4c6c3f00cf9b17da5914e70cdd8a81289e76d877ff5264b93c9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to directing users to malicious sites or downloading further payloads. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=cambridge+grade+8+math+book+pdf PDF link annotation
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d81f23c47588f603522307324369103e/sifaf.pdfIn PDF document text
    • https://allianztc.ro/files/file/fubotezowiworupasimedifa.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/96689257358.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f52ffec4a81---54300980548.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/gvht717baikrmkdf87sb8pt97l/risavujusevasapajune.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/97862997140.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/fanoropujerijanuf.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/boranasobatafef.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4946c2efd---2841619590.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16085453de897b---budesaw.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/varilapobikuvi.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/52417738913.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d81731e1adb---mepiveriv.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/wabofotisazi.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/f3bedfd5d91d2339eeca4baab77d41ba/21914588158.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610099d1c3e61---vuwajofamoxexozo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160802f6da1277---budafipuwusa.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/mixumob.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/sobos.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd6689d5ce---jumej.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/sk9p8j12p786uajcp1l9cono78/vomotikofutat.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vsk69bjdc4ihvffnc9458rblar/56084805607.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/83309410077.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/latopixirevujuwewegates.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/eb3nl5men34qnhdr881vfectbg/99944509988.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_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 11100 bytes
SHA-256: 10eb0e3d1babbe45901aedfebcb42a383639d509957014bdbdc87db95b3e3bfc
font_01_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 16928 bytes
SHA-256: 870ebe2192664cbfe66fe93abba09fc8bb74065af22723a960bc7689d1563085

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