Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ab77f87772a5a0…

MALICIOUS

PDF

99.3 KB Created: 2021-09-20 07:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c9ee7ef1ddc267240af5c6edccd559b SHA-1: 636efb71c38c6b77a2eef92d1e8936f29267a754 SHA-256: 97ab77f87772a5a0d3746a92f3ffe2734da308fac01b96890a632826fe540d03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+win+friends+and+influence+people+book+by+dale+carnegie+pdf PDF link annotation
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4855b4d94a5a9022bab54cf00c1cf099/78797912235.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15b95d2e8---54594919345.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/pilek.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/77668043299.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/rakanutenek.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/84469526510.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/kazupep.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/mivurosokawapuwuxojobof.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5169972f547f251172d2e63e4dc9699c/nezepuvotipufojed.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/e9uk29iu5tf1thb4bqkomna3j7/figezamov.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/jafuxoxenisis.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/nuwafesopigesibiwaz.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/jewufiw.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6852212528985da8c2b9461ae4a4f15f/75028049616.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/marekivaki.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210908_EE51CC96F1826CE9.pdfIn PDF document text
    • http://atrsara.ir/resource/files/junowufexaw.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/65193674265.pdfIn PDF document text
    • https://phr4u.com/files/19655047731.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/47326997664.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/73325315639.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/10589547377.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/gilazikasomaxepez.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/sobeturemudomesimaxuvixi.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/98638359523.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_off000120d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 17552 bytes
SHA-256: 18a74f7e84c532c95bc5030a717e5e6ef2489f5020b61a2543e189f8775af012
font_01_sfnt_off00014e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16633 11320 bytes
SHA-256: e9a4edd428ff00486c8a8db08094bff274371a33de15496579ca214969a1cc96

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