Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8536e6105ac09e…

MALICIOUS

PDF

92.2 KB Created: 2021-09-08 02:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 997427fe2ee150cfedd9d9083d802e47 SHA-1: 68c96ab26603a1e1d85d1a170f29e38dcd9598e2 SHA-256: 6c8536e6105ac09ebb857b7a6bf3b70e532ef28d33a9f60645a059a00f00d555
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'Clipboard command execution lure' heuristic suggests the document instructs users to copy and paste content into a shell, a common technique for executing downloaded payloads. Several URLs were extracted, some pointing to compromised CMS uploads, which could host secondary malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/38550795826.pdf In PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/9fdaa6d2006ada2389605cc22128898f/vusivimezixiseg.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/42578947454.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609faf665ad9b---13970160479.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/79444673480.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607732bd768c8---31724752245.pdfIn PDF document text
    • http://landpas.pl/upload/file/99004250580.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092342b6a6d9---91571535597.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/94a9ff23cceac09ed64f8a982298c497/91948089067.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e60880be535---12907481648.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38008aa96---43197724605.pdfIn PDF document text
    • https://etadelloro.it/images/file/bomilebarozexusumogiwa.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/80542178542.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee89a9a931e---reguvonokedepaj.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/10b4a726e6ae836a1f67c9848ff9a4d9/zuwabuji.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/fiwafalababukuvixax.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/60938797344.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ca1efd4c26409213b13e1f66b4a9a289/gusirijikaxa.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/nezobe.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/fc7509e0d8185c58d7fba9c1ceda19ba/26865221268.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7e930cfb9a8fa1559489cc4fa43735f1/84803283694.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/43084225088.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/jonaraxojofedubokut.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c07b3f3a467404b8e20d6d96f2f09563/lukijokupupulamelerer.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210718202653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=piping+isometric+drawing+pdf+filePDF 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_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 11048 bytes
SHA-256: 2fb09901db6da761d86f9ad37b272bcabcf9513c37e55c8462059c16292e8784
font_01_sfnt_off00011e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2B 17076 bytes
SHA-256: 7a44004bb9d5663a19833490a8230dc823c308238b20edd2507e4a8976a39f66
font_02_sfnt_off00014aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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