Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d57fda703c34f0…

MALICIOUS

PDF

73.5 KB Created: 2021-07-20 13:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 08522219e18d13795c662e356956a658 SHA-1: 4b64ec2f65a41ed039f9b8b08f1023d849b5e1e9 SHA-256: c3d57fda703c34f0235c0ae1bf8670138564bc88ad6c1ac8b0a45af7572702af
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content, suggesting an attempt to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://matskaren.se/anvandarbilder/203/files/72576533143.pdf In PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/73707254029.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b2661f0a9---46997253730.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/99147263292.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/oag1vieeb8an4festdrllo8i66/bedurisa.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e83190565---bexabenibiwikudix.pdfIn PDF document text
    • http://apple888.vn/luutru/files/legamutesutalobotofenel.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/29819447189.pdfIn PDF document text
    • https://onlinendttraining.net/files/gigerazotege.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/rosevaz.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0501b58f3---wudapumedigunefon.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/p1s4044fn317548enm088dg95v/61041802187.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0565f12cb---19390470541.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/39116667946.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/575b5b97f5d225c1226a0e8a73e9b279/48155866253.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/rojarenoruwekekas.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-13/20210713220943363129.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2b286508---52572008441.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/aa8e350cb5e3b9a1dfe28f2c0f196259/nipajo.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/23416020375.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/vatonixoduzukol.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/t7mpf99e0lqi4gpao6nbudndnn/kegomepetidifitirapamep.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/buvufukazidalopeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=it+strategy+issues+and+practices+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 16836 bytes
SHA-256: 5d393b2da4ee75dc1de48019436c2c1734323566c88264308695076f1b66627d
font_02_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 10792 bytes
SHA-256: 263c3df30845062593176bb0bf35d1ca9845254933837e6e6109f5ab6b7a0917

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