Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3019e6297af1cd5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 06:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea4cb338584892f99ff68a7aaab4024f SHA-1: 449c594687cafc14089cab4c0d5797df8606faeb SHA-256: c3019e6297af1cd50cb8166b89408a16779d546ad9de367c36e59b3587ec98a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm is a common tactic to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://kolaykanal.com/userfiles/files/lozigosukupuvunowaxikoxo.pdf In PDF document text
    • https://estoniapools.com/contents/files/42412686217.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210522010714.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf093fa1a---lumazipadukuwoniv.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/pop0frfnr0jepujj75fa37h1lk/sanow.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/8ee8d5799fa8511f19a2e689fa33750c/luzojoxufukibujamegojakuz.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/95518400490.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/4j58cvnbecd9tm2jpdhc4j0hlb/xalozuwobopatesajig.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/31061285917.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/sedapinejapewuzuzo.pdfIn PDF document text
    • https://derfo.info/resimler/files/wabajamotefesotuniwulofar.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/8cf59817e49bb1a81038013939ed01b0/99474021439.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/27336402410.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/dfcb97dc42940bb3cbd93f22bbc952ca/5800851486.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/cd81186a8e180eea126b526b752acc78/jowolizada.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/57623015029.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/nuwefirujebonadovovuxa.pdfIn PDF document text
    • http://sam-global.info/files/file/zofese.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/80657200730.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/figeg.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160e0904854022---33803516168.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/fizizir.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d66fd079a694042a6618edb7013cb2fd/83303221207.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/n983fvcelbq4aulfn6u117ght6/15421823088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=profitability+case+interview+examplePDF 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_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 19084 bytes
SHA-256: 004f9967f8ea8c4cad47229abbafc8b7d5ac6360f1fe528096d5aab3a46d4369
font_02_sfnt_off00011b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B07 11148 bytes
SHA-256: 3e433a331bdad5b516d08f3008f7de332050b06be062df9400b80773f670a8fd