Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e3a439e8b85d08…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 23:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 309665b4aaefb93d57fe2ec2abc7c305 SHA-1: c7c17b2d7d9aabd6c978950a2371ee1bbe65ac75 SHA-256: b5e3a439e8b85d08acfdca88242bf49baa98b18cab3ffe09009aeb0e8d422879
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, which are characteristic of a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the links and the detection suggest it's part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707ece77684---ladiwif.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9326pqs5re3v85ep8nf26sp634/fobixotedoverem.pdfIn PDF document text
    • https://sealskinz.ru/files/file/pomuwizokajevidanuvolof.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff88b8f644---74704353126.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/51611156535.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l9lgcj2rjj1m8gg7dssas34vf0/38832855493.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/20fe2a73ab4f3ab1c6916b8f8e9f0f8b/45313389991.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e301ce6ac---41377520169.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/08c5b00ad1f14c21199e2b1c336b498b/semexovozixozuvinaji.pdfIn PDF document text
    • http://stevis.cz/files/file/tebenora.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/kkquaq88hn8anv7kte4052fkl0/60193715945.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160955a58e7c1f---16142580361.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c277f0d25---20938031396.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/vajekugodosonixudatubudu.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/xakorifoxi.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/10292804509.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/38724810240.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/p8md92782vgfhcsf7l03b0pdt5/rupit.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/20277812186.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/fofugosisimapib.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/s5t4ng9b91t0f1csl6101e1tkm/45217047432.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///dutibetesogura.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/a57abc334b42e2c4b16d834bf770c00a/90869199935.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/35497469031.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4bc6f2b1---zutogojabobob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=good+annotation+examplesPDF link annotation
    • http://www.nimh.nih.gov/health/publicationsIn 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_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 10592 bytes
SHA-256: b5ede1217edb400ba3b3f76edcbd18dd7712344d6d00f9cd8d792fb6d882e547
font_01_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 18416 bytes
SHA-256: 716cd7d51bfa11610ded4b988a82b1cd34078cb6319d9c02da80c7fb310d306a

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