Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c11c7fff1153474…

MALICIOUS

PDF

84.7 KB Created: 2021-08-16 07:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdce2a151e59379ef8ef82624e567035 SHA-1: 3a7b474a57328083e07e431b6b817f993962b5d4 SHA-256: 8c11c7fff1153474f9c86ccdf359e8d36556947465978df1d450e4b3e496e783
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 many URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://hit-air.pro/ckfinder/userfiles/files/xoloxisisezubul.pdf In PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/woleme.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1eb7e9d645971f6998f2fd7e707b2e18/3362404512.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db9ddd7fd4---25096705474.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/dodarolurizi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075b35116bc7---85023428392.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/jutaziru.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49bcbc737e---lutepurolese.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/433935333418d183e68b8b606f0dd9f9/zulasolo.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/183e5cb7c9a40173befe9098a6002f2c/mimon.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/4852532836.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9d98ae76eec947c4308897fa8da8d4d/fudidapuvekokezesegesi.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4637c28a3---43120195003.pdfIn PDF document text
    • http://bscartridge.com/pic/dukili.pdfIn PDF document text
    • https://majubesar.info/contents//files/99909386808.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca74ef9e78f---pesoso.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/pegomelujurab.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/solobigizux.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210716172014_j95d1a.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/dusimaxuvase.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d5b1c16cc---sidamosawaxabiposorox.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/16917408807.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/9cfb3d904fcbe7c4db73cdfaa7fd0db0/45947024021.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0qsgs0he8m5v6jr2mm2s3alus4/rubewikefaxi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893dbfd8c0c---87857885207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+draw+anime+girl+face+and+hair+step+by+stepPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/wikapuxi.pdfIn PDF document text
    • 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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 16608 bytes
SHA-256: eccde2f236596c9da5145eb7a1697c1ec54917cf9ac44587b859c21af25b4e24
font_01_sfnt_off0001121e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 11400 bytes
SHA-256: 09d5c0b5ea00dafea1d5a8bada21a0cdb470d607023b66e01b271aee9c51be14
font_02_sfnt_off00012c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1