Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8fdff2bb7149f0…

MALICIOUS

PDF

89.0 KB Created: 2021-08-14 18:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: abb8b00e7113adf63958131de037997f SHA-1: 3cd91ad8f9ed0b64ec5a9a42ef933f59084fb3ef SHA-256: 7c8fdff2bb7149f0587e729af3d9759d12011d9277ad3a911eff568ef1f9dd39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/50418ba2579ff79ec5f5f5bd86cab01d/53585296618.pdf In PDF document text
    • http://aldo-ins.com/userfiles/file/11537150216.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaae254d96---11585701396.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/j9t68tlruvjjb8fa8bn2pk5202/kewunufilexivireweravaw.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/j2b2d2j8ig960t3dgeef5sm9br/70789287050.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/rjosjgcsaq6jkbp8tvoaf3fhpa/pubot.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b53badc4ac---povigojononejojavozobop.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/bukavusuragoraw.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/tefida.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///vaxanoruwufex.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/5664745630.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/87deae596ff0b23857b35d8a26108f9e/32650935224.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b78b1d8d27---38540288057.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a1fa7d116---wupobunogebuzileveludufem.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/gazirifelibidinuvekoxo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e1fe072b---93968501173.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f7950b73---tokevasuxaler.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccc48159e9---25376864851.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2nhj0cik48k7s3c81jjnu0mpfe/pepuzutozuvavinenibew.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fda7068db3---fatibu.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/wilodizoru.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e2436879f---sujedina.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e8e25362275210f94ee52a9f44c85583/31364099246.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075619b80724---71040017820.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/nagidetutifor.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/232f359de58240b207de91f20ab8a57f/45625265043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bestimmte+und+unbestimmte+artikel+deutsch+grundschulePDF 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_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 17544 bytes
SHA-256: 9810146468f7e8f970b77ff59085354afc7d0e3f1dcb356128121d1ea46500de
font_01_sfnt_off00012241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 11080 bytes
SHA-256: e69ca3b264aa81f4c0151f11f3d878e5c67b2c905e0ee288280b766d397f309d
font_02_sfnt_off00013bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1