Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4f3c029574aa19…

MALICIOUS

PDF

115.2 KB Created: 2021-09-05 12:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ed6da87fc71b28bd85838f9a79f7c218 SHA-1: 0006f73fe26417638a1db3f8785d7a0f9fb20bbf SHA-256: 1d4f3c029574aa194c1325d0eb0dd6d1b92c35695a66f9106f1bff4669406d60
124 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV, specifically as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4560

Heuristics 5

  • 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
  • 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://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/5053046291.pdf In PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/rejepofirekavotuwumiru.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f48ec216---37759813789.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/99003919685.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/xovubu.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b17793be88a---43451387627.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/sulugekezozofo.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4c3c13a44f8e8ba472adb3daa45eacce/81862319976.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/84845531602.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/wetojikanokaxalafuz.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41e1cd17c0---69516182418.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c889109786c---futunelog.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/5i16nao7g7psgou68m732ar4ef/92910201092.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/28644160030.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/maxaxokigu.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuxojer.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e9aba0f35---gabewemowu.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/51706853372.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/aac1e58951c42455328803cb195a548d/vofubolodofuleweso.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/729aff62f979fbf19580ce61b68460b8/wagugunido.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/5309044961.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/48067707931.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/28503741578.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/rusojojomojifogopexe.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/luvuberedubitemubasig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=teks+khutbah+idul+fitri+bahasa+sunda+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001a0c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A0C5 28684 bytes
SHA-256: 0513574dfd3aeb68ee9711eb1b0acc5f1f3c715c5092b535054826137913e185
font_00_sfnt_off000145a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A3 10772 bytes
SHA-256: 0ae84a96ada909574aa5cb56b62efc821763116650ebfcb89489406cd1e78957
font_01_sfnt_off00015e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17636 16572 bytes
SHA-256: 5095d789840b7f9cd6f86179e8872c173c750353bfe4b813242cdaeb8513bdef