Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7898cc3d66597d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 10:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09a292bd5a78c983423d9695f335301e SHA-1: d75199968ada78f68180d4e2f9418da668b1266e SHA-256: cc7898cc3d66597d03478508760c2b99a205a0132300d40fae6df09c4aa32cea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The file's structure and URL patterns suggest it's designed to lure users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132107f4f7d9---83316260463.pdf In PDF document text
    • http://knupress.com/pds/editor/file/gimirigakusix.pdfIn PDF document text
    • https://businesslife.com/content/file/88393599029.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/dikufu.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/16396260725.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210908061313840.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/rugegovavuzen.pdfIn PDF document text
    • https://ptogel2.com/contents/files/7305959719.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/48249107857.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/85173153793.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/72976194635.pdfIn PDF document text
    • http://henca.com/files/details/file/9549642169.pdfIn PDF document text
    • http://retailcop.ca/files/13235003293.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/serazo.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/bowakajovesilerizeb.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613520916d434---36563673314.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/85870282562.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/nezedefadatunibojo.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///50321385644.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/47ce7723e4beb928d0100e54181f8038/28185062480.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/gexaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=crash+bandicoot+3+warped+romPDF 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_off0000bda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 18192 bytes
SHA-256: a766f56b1c99b1c13a4483367f0e59eda589e59010e3ef8934a191ae480bfaf1
font_02_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 11160 bytes
SHA-256: aa93b95989505cefd031cbe1f16d35cecb73e351d4edc80e21c2e985b7e87175