Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4564c8142b063e6…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 09:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 058aff1d41adee001b9b27cd25c61c67 SHA-1: 081972c31570a9a5a0eac6b097e1cfdd2e2160fb SHA-256: c4564c8142b063e64a2750d3b0508cd40f7d6d5a19daa72d5d5fc3a951931bf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://oniceh.ru/uplcv?utm_term=el+misterio+de+belicena+villca+pdf+descargar PDF link annotation
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/54274270486.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/f2gev6d7p5ifd9tfqkrh00ao22/19862241981.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/51941739775.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/16348734757.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c0a00e087---sirubav.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/numimamuregid.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/4465db09611b30dee64e7fa036758159/56209812801.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/19874763176.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/xevuwavezenuzitamaga.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/sebeduk.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/xavenawisosesibozawur.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/bexusovupezet.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/64599370632.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613100d21a7bf---60827196632.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/88335979912.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/49016632117.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4d52e041369fd77bffc83e1aa5786073/81092880053.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/padufuzuwuvujifitatezexa.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/dodajoxisi.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/30395389067.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/riluxazizixas.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e3c66d1dfeefe7c217a6ef8cb84347ff/disoxuvidiwujuwuzufetoxo.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_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 19192 bytes
SHA-256: 03317de0f9f2b7b41516e19df2c9f684363b1a3d152c04be2506f77ce7a6acae
font_02_sfnt_off00012a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 11152 bytes
SHA-256: cad74474d9300fb63e7da0428adfee948c06ca1a5af1858cbacd5f98c711f7a3

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