Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cf5d36160e88f8…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 20:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9975e509b4c88bb4c40824bf1a1564df SHA-1: 5fe631e1a8a77d9bcc1a45a403d6f6c6382ebae6 SHA-256: 77cf5d36160e88f86b44d0aa59e28b1ae250e41c5fd27e61d94e37c6d31c1294
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The primary lure appears to be a fake download link for a game, which is a common social engineering tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://pune-india.info/userfiles/file/gekitozeduvavijeraza.pdf In PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/rolozupu.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/96935746388.pdfIn PDF document text
    • https://mbbs.hr/files/71142861388.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/81083678909.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/cfmg3a0g0piqku844gur3k8tm6/17263005669.pdfIn PDF document text
    • http://lblussana.it/images/file/28322086395.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210911212237.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/44006034843.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edff407cd2---wosidasolozu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bff849751---bapijawibigojog.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/83812451614.pdfIn PDF document text
    • http://it-hair.com/userfiles/64382819996.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/1479629450.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/kuroziwo.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/vurepotapo.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/fivakagix.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/92037501715.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/20094283231.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/82049125558.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///getefomarororosi.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/88567771033.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/jodesukiranulilir.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/79227066647.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/96934538270.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210906_DDA6713919D3FA51.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fnaf+ultimate+custom+night+download+full+versionPDF 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_off0000c0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 19536 bytes
SHA-256: 423bede7f8922c1f255280b30cded317880c6b1cf08955a3a28b8b8723418f7f
font_02_sfnt_off00010b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B24 11152 bytes
SHA-256: f917a2d9ffb971feccd54dcfded34664f05193ceb8458951f09e0c2fb5980880