Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c8863a4de3f6fd…

MALICIOUS

PDF

98.1 KB Created: 2021-08-21 14:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc3ff5f9a879b511b422bc256d5142e0 SHA-1: 8784d62787fa1b501b5374c9d04c6ade348e56a3 SHA-256: c6c8863a4de3f6fd2d4433db3ad25317870f85485daccb8c58c58a40b3b36426
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://huntic.ru/uplcv?utm_term=why+use+abstraction PDF link annotation
    • http://centrlita.ru/archive/image/file/kapinobixufufogedezidak.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/zekojejunosugilidofoba.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/85a10df4eb6880093460a3602ea3968a/sobegazajes.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/72628466167.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/49912319370.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e5aec5cd---49022624881.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/jopugutowed.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/lutimarodoxaruveputuk.pdfIn PDF document text
    • http://poorclarescork.ie/images/90635167147.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/47118668396.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0a573a07a---78084176453.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/91017640635.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/rararoraxelokogipop.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dabf0bfcaf---64224707010.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/73054984525.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/xijivogewejemotemubepunux.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/61425488141.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742be6b85d8---delitelegokogujerorif.pdfIn PDF document text
    • https://iohrp.org/f_files/files/lanabevatofenomarudut.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/64721456457.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b85d42fe---60754107483.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021080922550835.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a42dc360175b9ecfb7034b53091aa140/58444205245.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4c80e005d11fe674e64f72bb2610168a/dokafikuwa.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/69566448610.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd95a5e6574---8085646217.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_off00011c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 10628 bytes
SHA-256: 8f158e3b070bd212d69df53faf986f42798504d71cfd8b494466f6562ab510c2
font_01_sfnt_off0001346c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346C 17564 bytes
SHA-256: d6b42dc7fc23207910e3fd9fe5293622d6d3a206b3f33820671bdb829e83344f
font_02_sfnt_off0001629e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1629E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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