Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f656fff53690537…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 03:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b0fc8914d0a6284ad01fe585fddbde1 SHA-1: 1831aa140a853d70be17f421425824b82d4f5a03 SHA-256: 2f656fff53690537526d164b48ab56fe140fd4a07ba77c6cff46489e35361921
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cephedanismani.com/images/pages/file/rozixizifufopug.pdf In PDF document text
    • http://realloans.com/clients/73966/File/17238733332.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/90976116430.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/xepulusewiravofadazut.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6adb814737---larin.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc561db8cb4---43174524400.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611abadf38564---98865496009.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/1213363602.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/vojoferavafoxujisir.pdfIn PDF document text
    • http://mwclass197050threunion.com/clients/0/04/04fd426b2d2cb16e649a8dfb8bed347f/File/44699058399.pdfIn PDF document text
    • https://skspiti.com/userfiles/files/32819952255.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/palulagatiwanezilok.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/q9tcv36mncs0q915ga6re872jn/juzakukatudobowumenodel.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/vejux.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/17478285175.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202105281962_92093362.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad866d505a0---20840023708.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d84fa1f28b4---17332813421.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/lonusibabotet.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/64997582016.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/nopilugorux.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/nuremowapasusuviririfi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b43ef93d364597f5520f2245fa4101cb/somepofuzixetunokuroxar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=nsfas+online+application+2019+pdfPDF 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_off0000bab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB2 10952 bytes
SHA-256: dbbc08646a7fe71dc8a3f830cdfc90ea0bdf6f9b6cbc525c20962621bab8e996
font_01_sfnt_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 15356 bytes
SHA-256: 230cca1afa9cf9835a1a8a52f3eecbc9f724fe0226f9b15f68f87e4f98c055eb
font_02_sfnt_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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