Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba7bba0b24a1fad…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 18:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88017fdb1626e0e1dea5bf7df3f3a82f SHA-1: 9f908b61a6fb520d05d37906c5dc3742cb31e9fd SHA-256: 8ba7bba0b24a1fad9a6cf7a2c540177e90de7736391b06931f2abd4016dd692e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to multiple domains, many of which are either compromised or disposable, suggesting an attempt to obscure the true destination. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://automsystem.com/UploadFile/file/20210504160103450.pdf In PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/3n0b0d478r3c5qeg3tqliqn3u2/sowodunor.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a177f285321dab9f50b354a3d63b8950/73986573228.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/tinisogup.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/tasufirujetojazekixewima.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ccf0584ca---60326731605.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/41114338434.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/wefulikodafage.pdfIn PDF document text
    • http://candientuvibra.com/images/file/posuw.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/17122917526.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/68652170574.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/85404579545.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/996474e4ec7c3f514993a1ea4dc9beaa/95493979381.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/99377241228.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cu18jfinjd0rlalm8sbbak6tm1/50414403779.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8e599946431f0d3c9dedde3c95ff4d7c/60823566726.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/duzajipugomuwajigelukilog.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089be1a387ad---felonuf.pdfIn PDF document text
    • https://yasacompany.com/upload/files/junewikaguxu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d55d72500ddc34c5c2fafc30ed092a07/93357717333.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/94574361120.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9980480cbc94e58c61b77aa3ce3beb15/pupobiseve.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc48375d54---67567185790.pdfIn PDF document text
    • http://haai.org/upload/file/49926521584.pdfIn PDF document text
    • http://xsteelstock.com/d/files/63489495649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mechanical+engineering+study+material+pdf+free+downloadPDF 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_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 17644 bytes
SHA-256: 1b8f558be7d0f38a0e4b02398a56221f7658bb0dbd366b9e16fc6c43acaee879
font_02_sfnt_off00011e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0B 11360 bytes
SHA-256: 853d5dfb115d11a85bbdb10cee356e9e2dac917516d86ba0cf671b29d8a4e23d