Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd45dc1d233d56b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 07:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbff550e4335ef72fb3f071a25632128 SHA-1: 35d60c6de5e1376c60d94c586be47a5df71d6e55 SHA-256: 9dd45dc1d233d56b0f7665c8caaedf05ce650d0d3d843ebe96b61c22b5a2345a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, masquerading as PDF download links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the attack pattern of using link farms for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=pdf+download+apk+for+pc PDF link annotation
    • http://bdpq.hungminhits.com/files/uploaded/files/46506321955.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/41448378383.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e99a48f1---lubijizatalife.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161311dc046725---13000596668.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/wewafir.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/51220228806.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/75255218541.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/41544563863.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/zotewedozirovexajawukimim.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/68967369684.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135c00e1563d---nisoxezadefanumas.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455b33c5d82---tunolotoruwere.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/sewasox.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/808152689.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/48131593808.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/8632e8ba2ae2ac7384fb0815261dab59/67677035755.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/sanixomulunove.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7dcpkt3l0e56uc3sjl1f37lbcf/7090058631.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/nenepafapujag.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/33801380474.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/44355691679.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/fikosomogujepanepefofo.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_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 18512 bytes
SHA-256: de8effcda52c62dc8fb76119b803aa20cd558d2635eb87acb1eb406744c18d6c
font_01_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 10304 bytes
SHA-256: a15425feb9836eacddc05a361562aa3dd045371b477ba786896d69dddde1be33
font_02_sfnt_off000120c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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