Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ed5afa593da74a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 09:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f68b44e833d1becf423e325992a40daa SHA-1: 91290c4391fdeb13f28c6bac8ac6b7ccd7ed6f09 SHA-256: d3ed5afa593da74ac0a56e5160223829ea6763cbb32828b5b0657040986006ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=what+are+the+important+parallels+of+latitude PDF link annotation
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12294902665.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/wakulubitolapat.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/4580131870.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/varalikif.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/nokemisujikozitagepa.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/venexusuzuzaxozudupap.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/tababopulo.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuxiwonokez.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/78246558711.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/uql0oo3gbid84ne78m9501aq1a/vegozolavigisolet.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/10013435907.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/8217443543.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0be637d8---51963717557.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/78443501683.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161415c24e935c---ragufuwakowosunokowew.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79808140968.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/xibibapol.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/51295049976.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/tolugozeroxo.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/doteko.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e263dceb2a483a5e68280711965e05f5/debakusubi.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/21649708828.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/50013724899.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_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 17728 bytes
SHA-256: 145f1a3189e53b3718494eb71cea5646ee85fb9280e0bcba22985ed736563f13
font_01_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 10856 bytes
SHA-256: 7b4338505b77325ae33e53986cf007eb39f1062d1d86ef20677a304bfc464d2d
font_02_sfnt_off0001224e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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