Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7dff52787550ff0…

MALICIOUS

PDF

91.5 KB Created: 2021-09-18 10:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3b75caee3bef32f120feb6887c27bc9e SHA-1: 87d6d3d165cfaf334fd52e957e6180c0f92dacf1 SHA-256: c7dff52787550ff01acca893781f1ef21d63b8887a4d0534cc0bfe693043eed5
164 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://coretry.ru/uplcv?utm_term=sports+massage+contraindications PDF link annotation
    • http://www.scsk12.org/policy/files/files/xawotenifidup.pdfIn PDF document text
    • http://geoman.cz/data/file/lasegivetodid.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/waroxanajafovuworokobuja.pdfIn PDF document text
    • http://x-mobio.com/upload/files/9107381038.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/97235284941.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/punevazarixudidekis.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/67395608215.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16140ab5b69f28---fokozuragifosaraxow.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6jnhnhbu2rs7ogccqcmsm6g7a4/vixirijopumabaneviziri.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/gizulokapuzule.pdfIn PDF document text
    • http://epicridesnepal.com/files/vunajogazi.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/lafuvelukavekidovisip.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/54560041082.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/51085801982.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/modejagebabefunow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c35017f81---xuziwinidolifalilagubet.pdfIn PDF document text
    • https://arerp.kr/data/file///zotitugovukiguxosatojan.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/jejoxelijivu.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/bepafarerukaver.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/25625932151.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/395033374.pdfIn PDF document text
    • http://alkanboya.com/files/file///xadolebagalasarorir.pdfIn PDF document text
    • https://hsse.cl/files/nuxisupokimepiwivij.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/gusosebabilesi.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/44479174326.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_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 10888 bytes
SHA-256: c7e24d42e10be3cdaada198067b7b2d536d67801dee9f98cfba022dc82c326b1
font_01_sfnt_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 18500 bytes
SHA-256: 7142d99fd376b52d9b46c08bca6f1ac7c9ca3d553cec0f3ffb456c3b5c6ce507
font_02_sfnt_off00014870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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