Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adfa95aeef7971d…

MALICIOUS

PDF

92.8 KB Created: 2021-07-06 14:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc0d7f95afe40fa75e88c01fffa5ea2b SHA-1: 338eac024a5a82337ac0a862f67c05e4ad41ab18 SHA-256: 4adfa95aeef7971dbce84cca750469b7edcbe9bc38a504b8c2491a3fccf2e46b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm and was detected as malicious by ClamAV and an ML classifier. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the link farm and the high confidence detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://argumentua.com/i/file/tifalopewize.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3tbm48t071ovjrfln9ulccev5g/gifamumukadexixiv.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/pininikivepifasikubezi.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/25d7b06bfba88eec3d88b5840c030c66/wolotixodolubebujeni.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/jufezibirub.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd009b7aca---6412887551.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/6453353407.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ea7oi9he7ntdijiodlp1o3os9h/3318629276.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c3c7b45bd---11437228522.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/xetovozajodudi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160911c8860ac1---dinagubowepozagolum.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160835450d80ad---jinitoloboposuxid.pdfIn PDF document text
    • http://techbis.pl/files/file/84728912517.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/038dbd86ab3894729ea30bb4d85c3973/1882288983.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/1653c68868e5f27aaf90010e56c26fa4/purotozezabusow.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/popopawenebabov.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/17eqhp3nucc0fglb3rkvm2a88a/61873510020.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/89951442705.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/2a7mvhi8pnkg2nho9u60toh980/26175849330.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/nufaputujasuxubuxiwu.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/8399312508.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/20808785276.pdfIn PDF document text
    • https://soechi.net/userfiles/file/nokugikikoleju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=website+that+gives+you+answers+to+homeworkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 11100 bytes
SHA-256: b5f1f8de3125d71c3d70970d3f46ddfc72bb828b926ece3af94c826a7a5660b6
font_01_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 18780 bytes
SHA-256: c735635603123b772323a3603edb0db8c718db3b9afe7df4867e1f9612d718e2
font_02_sfnt_off00014bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1