Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c356e1bca63d9d2…

MALICIOUS

PDF

96.6 KB Created: 2021-06-26 12:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 076001c5a15edfc75b5dec59e87e2f7f SHA-1: f71eb060cc99988378fbdbf24ebda096b3724ba8 SHA-256: 8c356e1bca63d9d2155d0506b569a179855911e4358c1f6d70852ef1ab3af267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, with several pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. 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 0.9957

Heuristics 6

  • 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.
  • 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=narrative+of+the+life+of+frederick+douglass+full+text+pdf PDF link annotation
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9e99b7d24729748dcd0d6ecd6d7a8700/54086206037.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/1509167834.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/23073594381.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/mivozekexetamokip.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/95009399628.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b40e8ae87---3542871345.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/juxinumaxesunamim.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857c081a40d---91686792829.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pasesen.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/9daad804cc8699b408862fe15557ca75/tunalurizapaju.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daaf0196f0---32483975737.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/fb4ef257608b68a84d1bd87373a51987/40682233427.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607973c56de25---15015042066.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/mugolitijoz.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/84be3366067f960e0b76785d945977e5/77492910613.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca8fe4e3d6---5251751400.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/34595dd2235984fb1b2f1a0073da9761/lewuxid.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5dc0a401d83acdc338b2ee0bbed2e8b3/59533157670.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/74593626581.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/jatedexaxijiwudo.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/gopanogapabigeruxemenib.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210526214507In 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_off0001131d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131D 18292 bytes
SHA-256: 8cce7f51cc700106578d1539f3d84e32a033ca93574278640c4087009388149f
font_01_sfnt_off00014303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14303 11132 bytes
SHA-256: 7373588cfe895f2493ab8b34d82192559e0b6f9f94abe95c74ba70436b51758f
font_02_sfnt_off00015cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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