Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b4698e1c78f677…

MALICIOUS

PDF

73.5 KB Created: 2021-06-12 19:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 168267134c9c1f8a42679568b06ffa39 SHA-1: 978121d941d32aadd22eea759eb5a28ccec848c7 SHA-256: 91b4698e1c78f6770efdc99082968d4c7a90829395bc265e8e3cc1c85eec9225
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains a link farm pointing to numerous external URLs, some of which are hosted on compromised CMS uploads, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/uplcv?utm_term=how+to+calculate+sigma+and+pi+bond PDF link annotation
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qfgeo557ujukn18p8l72pqpav3/wagonasadal.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/312aaba80f9b826ad0739d74047c369e/bujanozapokenefituwopetan.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/86unpdrgup25ojbnh7qk9bno95/nutinapen.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kowobezeniwil.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/6mescfgapj9cknalf4ik5n9jsb/39813435276.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b0a519cbbb0---duzub.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783603addf0---gekise.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe46899e2---datimovobokoribukovamavuk.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e25599bfb2---30647372942.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/sazovitibowazudif.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/92050102924.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/litukelebebuzinovamo.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/bebuwut.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aab0797d701---75292908035.pdfIn PDF document text
    • http://bakoca.hu/files/file/lanotalozu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 5492 bytes
SHA-256: 9de54355526a9d74903e687c98d80b6603bb825eb57eda69453c3a7476795ef6
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 10984 bytes
SHA-256: b6d4193d98b6a178b751aaf3a1e6e41a85ddf5a2f4d543b7d419e2c060958a7c

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