Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0831e6ab483e34d…

MALICIOUS

PDF

89.4 KB Created: 2021-08-02 02:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 54ca9cd68c5ffe5faf18763dd350d09f SHA-1: 273d677c2bfca72ee34f5c0a77a05897b5a88f1f SHA-256: c0831e6ab483e34de1d2a9edcdff46e23aac9f653b949c7a4d02d9535be01905
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=how+to+get+a+lamborghini+in+gta+v+cheats PDF link annotation
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b35247451b2---jewarolejeg.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b83cc9c064e---duxivimeworotutizofipima.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/xekanexe.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ef10a031---gatitavebofelojaro.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/dopexadili.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/98403994814.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/24659396234.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/mibikawuwixotefutav.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9721939e2---mozew.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/34335308589.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/21104773191.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/kitixabirafunugonuv.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/v06n9b2nrb2tvll0o4mp86jm5l/22391772862.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/2951291895.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/20743693534.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/jaxuvutikaforaxokovafoxa.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/tasedisawifofulojunino.pdfIn PDF document text
    • http://toonesk.com/upload/nokujakanitibosinafuseton.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/warifegimosusazovinog.pdfIn PDF document text
    • https://soechi.id/userfiles/file/51695692235.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/rikesunewomovoxelapeduxa.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608211ea403e7---kujalupega.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_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 19468 bytes
SHA-256: 30d0c370c712a8a689721aed1a1a6452c0628fccd8a9975bcd62d881600713d5
font_01_sfnt_off0001254d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254D 10960 bytes
SHA-256: 8fb39b4acb8ef4d9dcf8c46e93900d3343dcf411275fac2a3d84631646e5ef20
font_02_sfnt_off00013e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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