Malicious PDF — malware analysis report

Static analysis result for SHA-256 981cb0193fbcd7c9…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 11:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37a4d0b73f2cf9e648f1e6fdc412c8e8 SHA-1: 1125daf08faf3317e431fe66afc92d1c6ac225a2 SHA-256: 981cb0193fbcd7c9c28111a15711de0cd07f5436b0d3aa2115a6fe63e093c207
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

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://catamma.ru/uplcv?utm_term=cadillac+srx+2011+manual+pdf PDF link annotation
    • https://ezokniga.com/uploads/file/20198321961.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/305edd7c38231b2e4fa71cab8ea18196/jofowiwowuse.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/76338764630.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/78429686434.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8618fbab91---73219504621.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/4jcghuun8m5cfc2i0punv9mep6/voxigenene.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/13bfb7d9d0c592852b3d95aaf6156f7d/28124925302.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/407cb7163233df0c17d74420ce2688b2/pafatefigegavile.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/36008483204.pdfIn PDF document text
    • http://blueyee.com/upload/file/232343486992.pdfIn PDF document text
    • https://limsurdua.com/contents//files/bigezalivavozebukax.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/vbrb8k648ikkvfu548n5vc6qpu/57949836377.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1faf014643---53606890274.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/kuzadotazijane.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d342ec3fa4f6f042233715964a11d8f8/13877538637.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/vepukuzumuwezager.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b7fe7745892ee0f574918824b5f9f56a/vojukowavufosifadoxetolid.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16091664cb7bb9---gadonugijarenifemujuxu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607403c65e353---rekipesukasawufusit.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/zefogumenujurap.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161154832392d0---96827813068.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/90564592196.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608215db62921---vilewiburusuxademewawu.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_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 16952 bytes
SHA-256: 73a1637439f1f8294b9eae9613f2e929f20665bb656c08b9bf8d3b5e89ee21d7
font_02_sfnt_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 10956 bytes
SHA-256: ef34b783d696075d074ffeda2a437ea63e31f19aa3cd76e51ce217f5cfa368f9

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