Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bdb78ca05aa92e…

MALICIOUS

PDF

90.1 KB Created: 2021-09-05 08:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc892bc093c4644a6dde7186dd9b9a1c SHA-1: bb5032e036c84e69e1b942b8cfd81f1226552834 SHA-256: f8bdb78ca05aa92eb656c272f59a2c50325188ba296eb83118cdaee01b4011c7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a raw IP address further indicates malicious intent, likely to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=partial+correlation+coefficient+formula+pdf PDF link annotation
    • http://hmed.vn/upload/files/26737658590.pdfIn PDF document text
    • https://dalba.net/other_files/File/55033171573.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a88fbbbbc17bca2250076aa08e7ebad/69125809012.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac363caf4fd---tumotokab.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16117d097abdab---lugimemadolesajizi.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e81d9f668---40094219865.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/kemibosogu.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/18697583045.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/41225978797.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/93a4c348855e7e883ec8df96da0e429b/35010145857.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/titiv.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16123721d6291b---48027101248.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/jitenibovivudonodomog.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2f8a47b85---noreparabuvurezasomevuxon.pdfPDF link annotation
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127675f704e3---domeguwut.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/36184320547.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c631a614b---xudemapemogusegisami.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7c61ca4b9---gevadodozo.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/fobawewewubore.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202108191425148135.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/7eacf70e43848f51e33792dc356e65ac/22307879282.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/dokugimumeredakagodinus.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/85340182378.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160987093174f6---938958823.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f79d38bb9---39609599918.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/26320969513.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/19bd12ae6357ed654a901ce3b97ee3c7/pabovupaw.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_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 10712 bytes
SHA-256: 891341bd555a46535566c9f830a584b2f4e4fb887991b2dba863d24c99779c5f
font_01_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 20140 bytes
SHA-256: dd6924fc6157d5b8eee80b32dc5347b74b5487958bafb37310615a065fb4b40f
font_02_sfnt_off0001418d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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