Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f77ac6981b108ae…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 22:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbc2689923c7154b262bb2cdeafb37cf SHA-1: 27ae0c6374d70ae6b399f4a94a9818df16e156b1 SHA-256: 7f77ac6981b108aefe6f20a07be33f7d981880962ec89b553ec5a8e2a1e802bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to websites hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://maintogelonline2.org/contents/files/53240452771.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329d6a9de82---31219590246.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/xuzidapapitolof.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-19/20210919053732258608.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/robawexin.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/sofovidinita.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/86da83bee15cbadfb0cbd93ffb6b92c5/newetudirupuna.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/86495272988.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/34910535940.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/sufijerawokobasuvenabusa.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/neduxejatisofujagage.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/pedusutapumaxijifelimitan.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/63801631982.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/dovigigulusowebademe.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/43314212590.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161434f762702c---bomutokixebojofixokije.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161423d8d99ef7---fefero.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/volijuforuwurev.pdfIn PDF document text
    • https://ebooksweb.net/files/file/99093049906.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/wuvixigevozoragasola.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/6514551386.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/57192016228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=love+wife+shayariPDF 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_off0000b1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A0 10288 bytes
SHA-256: a5b6d5744ce76dbbc3437d64253710545f8afbce12a95edfb987da8f07509a2e
font_01_sfnt_off0000c904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC904 19568 bytes
SHA-256: 9686110e7ad7d32eee09f07b82e4bc852b000d1613c69dd1038e07438b2fb2e9
font_02_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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