Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfca79f7cfb0c7a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 07:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 52cf34379de0b6cd6228c014f7cf3e9f SHA-1: 924fd82f4d91fde371f2be575528b3570a98d6e7 SHA-256: 0cfca79f7cfb0c7a7d84e5fb1e0c371401ee947d91a4785983d06859b2b32b94
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=accountant+interview+questions+pdf PDF link annotation
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb40fae6009---23340455010.pdfIn PDF document text
    • http://shamayachts.com/upload/file/95569837519.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2ecdfebf---jexurokizo.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/30465234592.pdfIn PDF document text
    • http://playworkspartnership.ca/sites/default/files/file/pijemafir.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/vakagi.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/dagidabo.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/750663dca8b12bde0de4e79d0a8cd5f5/40403131289.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d698b325b7---16362324030.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/28572056138.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/serozunorefagogudasuta.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/dbf4c45e99909cf5e7edf2fb663caa5e/kiwapikukeket.pdfIn PDF document text
    • http://talleresjpg.es/img/file/84221272184.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4bc46744dd1cd02d5c3921109c9b6c62/xepiwuzijogi.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/77782090475.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/99924351103.pdfIn PDF document text
    • http://yuha.be/_files/file/nonifitiganinolopar.pdfIn PDF document text
    • https://airbays.com/userfiles/file/55361503349.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/050dc43fcf06a4b7a40cd695c6846d02/83371749674.pdfIn PDF document text
    • http://princeverma.in/uploads/files/21953818238.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607463b799850---sapedewulipedaluw.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/maremekadetis.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754ded65123---nowomidi.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d5756a776---fusubaxasoso.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/21669748565.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/selarezenofiliwoguzop.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_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 10944 bytes
SHA-256: 1804c052453d2ea77fd353bf2650eeb97e2e45cef6f221cf22e54bf14dcccc9c
font_02_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 18256 bytes
SHA-256: d1b0a0a7262e14e06e7ba290a79f8d0a595286672b1d5e66dcc8f26b604aa3d0

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