Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4ef14f569df94b…

MALICIOUS

PDF

80.5 KB Created: 2021-08-27 02:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12ad4b733b8144a009eee990023917ab SHA-1: 314ea29292b6eae6ab64f634a9b719a1ddbb4bf1 SHA-256: 9d4ef14f569df94bd9ccdca3f4778185db85bc8b8bd0fd04c5e199861aa2ec58
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/bc002c6f3f60ae34155777ccf4da454d/wefinulesotapubora.pdf In PDF document text
    • http://maginsaatmetal.com/resimlerfiles/sojidojezibibo.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/24117636234.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/24989424898.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tusilakexamufedugetuj.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9767aec17---ximasi.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128170b95a4c---51559615308.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/jawaxawuxo.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/20408140304.pdfIn PDF document text
    • http://614move.com/clients/4890/File/82635845410.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/45499575180.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/4191190142.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/44335000310.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5c2fe70ef---gugidasedijerovevi.pdfIn PDF document text
    • https://isosklo.cz./uploads/sixufunip.pdfIn PDF document text
    • https://davaocarrental.com/images/file/92000840196.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/sokobevule.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/wosonigebunipiw.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/88891986468.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/88084645631.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210820113248.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/2414bfb5c46e431f6babad113b2837fc/62605176339.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/rixuganafajirurexa.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f6548e17de57944d5057932a5dc76d1a/83418565974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=articles+for+class+4PDF 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_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 10284 bytes
SHA-256: 430bc6a53a9945b5c7e645f1fb7d964917effd6873e5e4edb3a1231c7f3da423
font_02_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 16728 bytes
SHA-256: 787e58b405684d12f9ce4096459a9aecf91ed049547c482e1c8e63841b23c783

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