Malicious PDF — malware analysis report

Static analysis result for SHA-256 445d241e6aefe031…

MALICIOUS

PDF

78.0 KB Created: 2021-08-07 12:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ce66808b2a19092c5c2abc73b924588e SHA-1: ef3cfc2a08f11e7187217e2d47039d38f8cef475 SHA-256: 445d241e6aefe0318104b7656257dcea848417f5a7f5fd145cd5f921a74b0bc0
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised WordPress sites. The primary IOC is a URL hosted on a compromised WordPress site, which likely serves as a lure to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/e0af95fe8aeb29b9391eb1abe89e6c4e/kefutufape.pdf In PDF document text
    • http://ztkammer.at/uploads/file/bekowewobejomusu.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/zuxevilawaverenuxojuk.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a4394e0ab---vapewap.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/ruxinijasewaf.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c40df0df---vudafiporevufajet.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d7babebece1c03ba80add651ec46fb11/patiloxemotil.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/pifilasevapelivetef.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/46487960900.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/tijumavomagugasexukum.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/l03v4t39k4kd6ioos7tr0qhs8c/98484659409.pdfIn PDF document text
    • http://uamarkets.com/images/file/7079358611.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/69233185802.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/norewesuxinomimonugogafap.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ada25d75835---kutiborapenalud.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc34e49eaf---puditixosesiba.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9mfeubfqbas3ssunn7alupqve7/44284456689.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/15790546662.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c8bd3791f---8829917474.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/090105573310.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/55959397767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=beyblade+burst+evolution+episode+51+gogoanimePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC277 16024 bytes
SHA-256: b5c254f729aae88060226a061826e94543e5a193e9c7a1daf7533796cfdbccbe
font_01_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 11396 bytes
SHA-256: 0f008073972f502ae018b02ce26ad209780b333b73eb2e30e8f1c35760372217
font_02_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 2220 bytes
SHA-256: 62c87e2fbd029c828ebfac2707eb237a04e2e523caadac72492cafefa31c4b6e
font_03_sfnt_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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