Malicious PDF — malware analysis report

Static analysis result for SHA-256 caeb86c0088fb940…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 17:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a923e9f0b891fb87af8caf8b435d0a96 SHA-1: 6db41485b4260419ea05e9836c2d650bc29da3d3 SHA-256: caeb86c0088fb94060143c3226ddb1073aa76de0cc97ec611af4b1fb10ccbe18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=integration+techniques+book+pdf PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074266aaa172---gejosujorajaroximos.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/pebodixinugaj.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b818a6a02---50397090557.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/xixokupugimesafixadakawaj.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/didil.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb52db152c---zodifexunejule.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/10628066997.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/97908989082.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/kozeja.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/tapotazoralirupapuwilud.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021053102525376.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/ruxalizewakojamada.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/gevuxu.pdfIn PDF document text
    • https://aneri12.cz/res/file/67823196528.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b57a729073279c7bbb19855b8bc985f2/kelajikelevazesomali.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/33084732918.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/36136260166.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1b85df7a2312b14cad981afcac2adb04/novupanemibubidajikijo.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/rabenorameresiwaserug.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c740d8d9---88787183983.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/a1mlrg8si7sdg4j6rff5u5q501/27824785058.pdfIn PDF document text
    • http://labonscafe.com/userfiles/8512206527.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/xuvavosulaloma.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/duzabizesuz.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/difiwefilu.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_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 18276 bytes
SHA-256: 66072f1d677262fec0a9ac68fec672d7449d858e5da6db0cf9cd6d10a2ed2d6d
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001217f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217F 11280 bytes
SHA-256: 2b6c81c7ee561c177ac98ea0302509d07c91ef6917fdc48380a836011b1e8ab1

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