Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc004b12da37f43…

MALICIOUS

PDF

84.3 KB Created: 2021-08-03 00:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 974373de86ae51d299b95b8bccfef296 SHA-1: b39d6224f2d2ff152780538712f5c70f08e1d8dd SHA-256: ccc004b12da37f432e2396070387f5c37187c928c540872b359cc354a5cf9c28
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=how+to+count+the+number+of+atoms+in+a+molecule+that+has+parentheses PDF link annotation
    • http://polskienarty.pl/data/aktualnosci_imgs/file/34314633385.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abea9b85d62---64390622902.pdfIn PDF document text
    • http://beateromer.com/bilder/file/xupavakogabum.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/50693054359.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/40604410662.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429010444589142.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/29873448745.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/tazesisenito.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/tuseva.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tvtdeddhq1lrg9bffqf1rmodll/safibevamobazu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/57b1a0d10660afece36666c13883c37a/21469893328.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/nojifotof.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/vezawukojosifulumotaf.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/wukusixipopodanudowivob.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ulq12gehcsr1b2ou698e7pkbc4/50773656885.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/93729011566.pdfIn PDF document text
    • http://land89.com/ckupload/files/88962580726.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834f2a20d41---lisomeri.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ojicjk6qmdv3ulqphefu4otvfo/30987457131.pdfIn PDF document text
    • https://securitydm.net/slicice/file/31902962876.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/3467959443.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/duwopolefepelajero.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/zafulokodajewanew.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/gotagibupa.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_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 17400 bytes
SHA-256: b0f1223393789d1f34b674c429d1483076e149a142da286fefdfb0e889e6ad00
font_02_sfnt_off000129a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A7 11064 bytes
SHA-256: c50e318393370eb0e349b97c4ea705e82e0323c6a4b2cf415a0d582c7f7d18e1

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