Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dff256e939d4c84…

MALICIOUS

PDF

89.0 KB Created: 2021-09-05 15:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ccafaf50b1e14de2967dfbe3eeb39b5f SHA-1: 196ef957d9517b10ea54aadb062402ce781b9bbf SHA-256: 6dff256e939d4c84b10f26b0f53c6a60224266df2ccc07380487bb03e1eabd48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=camry+2005+service+manual PDF link annotation
    • http://aarogyamedico.com/userfiles/file/nesopegojeperofikaki.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/wojifumolir.pdfIn PDF document text
    • http://bociany.sk/media/file/gibodifowaradiwomupezek.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c7107cc033f---57270040163.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/26339570915.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bcee8a78236b617d81fb852055448d47/47483722158.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803ba763679---nagurubolesudejivosabu.pdfIn PDF document text
    • http://indemo.pl/Image/files/5896721444.pdfIn PDF document text
    • https://tepihtrava.rs//files/fovefuvimebezimonodobi.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/mufqm010jfoosp2fgks7bi848v/kejuxosazun.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/66870538461.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/kegute.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/komexiruxobewenibigofabag.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xinigujasepiduz.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7f99193e5---watosizujafupemirofigit.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/bubaxugapojawazuk.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/wedilagozavipujaj.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a9a66bade---povewujisutanobedapuwad.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3cf76c60eaa59f5d7a99714330879377/kagotunevimosozap.pdfIn PDF document text
    • http://industrialdevices.in/uploads/81339068202.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/082a0e9e739b9071ac47aeaecef9f632/beriforuwetobab.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc9a60d1f---87062876699.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/16895259770.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/66913249903.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/48880916369.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_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 10860 bytes
SHA-256: da4b6e96f6afbbfe178757cfa255214a440c8016fa30aac2e00d4a336f24d27b
font_01_sfnt_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 19048 bytes
SHA-256: 703fe3b2976d7bf283551f9a2e4c6a0a39d13dafa70e1ad042ca9f39cdf29207

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