Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7236620d5712bb…

MALICIOUS

PDF

69.9 KB Created: 2021-09-12 07:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0bc0e4747297b751dca5a03208493523 SHA-1: dd67fe61dc86396f282ef3af02d7ea1ff20d5c54 SHA-256: cf7236620d5712bb49a68fa88ce7de745a187188d2db88ab91767635dc8a7ee6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://boldino-hotel.com/ckfinder/userfiles/files/gatederatupebitijewifigip.pdf In PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/827c3b4f8c6f014d4139ccb2ba745dcb/bawinupo.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/8003672425.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/75550477705.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135e6b7360f0---bewotafosibigus.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c6ebdda9f7e5a157a6d339f5ad275d57/wuxetibaduxojiruzamekunes.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/rofepusazug.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/siridumejaturimezif.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327ebd4be4c---28654086178.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/moliradusaragakivodunusik.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/78659791956.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90036344993.pdfIn PDF document text
    • https://siroyensao.com/upload/files/jewutulamajixoj.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/59884617049.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/ratuwasusafivoxuke.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/taxezoli.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-11/20210911215434250408.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/909050208.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210903_000845.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/17540527686.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/jubejofedizutude.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/bujoluke.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2759e54636c3ee8549c08a7f9b44de26/33061855362.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/99096486525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+studio+videoviewPDF 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_off0000b39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB2 10268 bytes
SHA-256: b18ca154c34a0b23abc6ae9b65c8c516f1cb71866f14ca495e41a6925bcd412a
font_02_sfnt_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 15236 bytes
SHA-256: bc980b56c1eb6f27ab661aec53c923c082b1858961093915ec55c77e0c19c6e8

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