Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb77e6f3d76c8ebc…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 13:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8cb011a6f4fe731dae987bb65ac2f940 SHA-1: acbf426526cdebd631348dc84b549e5bb057425f SHA-256: fb77e6f3d76c8ebc6d7008ecaf287136533872a843c1e81a33eb5d0b6b0005a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=how+to+convert+pdf+to+word+doc+on+macbook PDF link annotation
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4d1rf2po9m7rcuit71hoo8smhe/3128133045.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/aukpugfepdu9r5aja3ilu0r6qv/xelesijoje.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202108231513596933.pdfIn PDF document text
    • http://trhs1966.com/clients/b/bb/bbabdd843433c1cf4d3e80624837507c/File/vigolulukofof.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/98bc30cc5822282f4df92548d2958ef7/33478989520.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/wekajebenutasiburibo.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/31526723003.pdfIn PDF document text
    • http://turatabor.hu/media/zalofezexudedazuda.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/vulusajexewagilenaxev.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611c77da200cc---79439324892.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/tewonaj.pdfIn PDF document text
    • https://auto826.com/uploads/files/32450205215.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5a4bd115---50423619810.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/99b770bd09659c9e52f4017955f6723f/jidufagitiximaxulelaz.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/24181123950.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/94897084526.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/sunaduzekelemefetowo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130195a4c61b---xexudorefib.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c6e6055b48b1585ca51deef64959a3cb/17072370652.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d53e4c52a1---66907412294.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210701192949.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/vepagifulokesowog.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/zifojovivefasigakugaledo.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_off0000e390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 17408 bytes
SHA-256: a1baea9f393eaa0f847c5f23cbc1993c72fb6ee2c3bf8f924d89dd877f62ebea
font_01_sfnt_off0001109d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109D 10852 bytes
SHA-256: ef25b93475b04534be5de7d3e53a6f173997cfc98c8a7c89ddc72944c6fd17fa
font_02_sfnt_off0001297b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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