Malicious PDF — malware analysis report

Static analysis result for SHA-256 609917cdf581bc2c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-16 15:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0b624ee69a750038d9bc14c80be343b SHA-1: ac73f8af386569f351a0c9d3a02a6bf94a4e524c SHA-256: 609917cdf581bc2cbb15f93af7f8e767f2fb3ffb152b1fcfc2865c059d21f0d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to trick users into visiting external sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=jetaudio+hd+music+player+plus+mod+apk PDF link annotation
    • https://grafconsulting.pl/Upload/file/rotitavarumavipexow.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/9860360003.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/fekejokegipolisox.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614137a945ebc---58543073031.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/90692152354.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/jisoguzujizireliredanitu.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/vojikarafebisufiwevadew.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/52094116526.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/zatowesusizuwu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3743dd69ecc7685084f5fb2971a49338/lixifikeve.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/28998562409.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/tipemegamosenatagal.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/42900582855.pdfIn PDF document text
    • http://afslab.asia/upload/files/nuvanamotesubol.pdfIn PDF document text
    • http://olympusflights.com/files/files/vitigos.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/60361918128.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/95636028439.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d44ad7ccb3---17477419841.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/74056702888.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aecca25b81---kugiminonedakinuzin.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/miforugevi.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/wuzojurusavipijagevi.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/wafisirogosipatiwido.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/zemaxojefawonidepaxiwi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebdc57afbf---59155469683.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_off0000c34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 17272 bytes
SHA-256: 201456919f1515de861a2fffa8299ebb17b4ecc1029932ed966d335ab28deaad
font_02_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 10972 bytes
SHA-256: 6712f8cbdcef5d14811b29bee78051a06642ddfaeab6f679499e526937ba79a9

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