Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf478ffcd936eed…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 16:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66bc4e0987c717f02238c502a7a05831 SHA-1: bcc2d6ac52a6f7c0275900f883a26deaae66adb9 SHA-256: bcf478ffcd936eed1342c1c022d72d81dfabd42b2a44d51222722e65f766fe6b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://maulich.vn/attachment/files/nejaxuturexezox.pdf In PDF document text
    • https://xn--psg-9lac.hu/files/files/zizuxibuzateb.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/83048623960.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090522463126.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/58035416656.pdfIn PDF document text
    • https://adikmanis.com/contents/files/32241685599.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210908_20BECA7E0FC9DAF1.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/negurudefad.pdfIn PDF document text
    • http://learningkey.org/userfiles/39982250862.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/acf07085d8466e0bdefcfa4e6a915789/90414127009.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/88688582731.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/lidubotubaxaxowimejasez.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210917_C46D9E098B9D48E1.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/lewalajuwowaveruxa.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/53017391618.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/fegomume.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/17908615392.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/53422287577.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f092858453---werozivirebene.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3dbe5d1a2---43016651225.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/19944697886.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/48462367653.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309627935f2---gedanokuvemolexu.pdfIn PDF document text
    • https://mcsfood.com/images/file/1140942669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ros+cheat+aimbotPDF 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_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 18404 bytes
SHA-256: 2ffce8c9e6accc737aaf25ea6e17434073e0c1e9b1f9af0fb036845ac70cb1a7
font_02_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 10428 bytes
SHA-256: 6fbc383373887a2810748212df030fd40e2e54f2ead0c6c5f56d81a71bb61c7b