Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edfc17b089673f0…

MALICIOUS

PDF

88.5 KB Created: 2021-09-08 15:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6114e644796fb10d47c2c9d45ba00fcf SHA-1: 64717435ee3b6e04c7bea9947c9a6b1938b6d549 SHA-256: 9edfc17b089673f04003e7fc91a9f2e385d9a7b45a93660bb3f8cb0624e107e1
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of PRC/3D content and duplicate object bodies are common obfuscation techniques in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://polytex.de/sites/default/files/67904633149.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/35956346947.pdfIn PDF document text
    • http://chengzechem.com/upload/files/zumeguganofisuxida.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/mezovuvojinoxefusow.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/58553974512.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/fepanafu.pdfIn PDF document text
    • http://industrialdevices.in/uploads/72189132375.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/41059295180.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/69738232729.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/lulowematet.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/72904530395.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/23513779626.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/duxepifulafasa.pdfIn PDF document text
    • http://nut-shell.net/upload/files/kemazukigixajekevorex.pdfIn PDF document text
    • http://videocycling.info/files/file/fekiwajabosowusize.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/ca7b4814afeef3f74c087eb816d5fafc/75548731405.pdfIn PDF document text
    • http://sql110.com/pic/88001005039.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/buvebot.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131925f23ec3---33361917034.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/lozakisobunumibe.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/84025581455.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135050ec9de6---potupewod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=funcion+de+las+valvulas+del+corazon+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 19984 bytes
SHA-256: 8c891c4022bf4b61a1b82b6d21142e7eaa06d9d42100f70720e968d0133bdcd7
font_02_sfnt_off00013ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA3 10720 bytes
SHA-256: 550864cb3b85f3ca1a078ff7577141d28cedfc7be017d917d6613a878cba66bf