Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17f05dc37b03897…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 05:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9b8264654a104ff96ff6b47e82155312 SHA-1: 65a59c7210588a42c0278e0d701e2527c336ebd4 SHA-256: f17f05dc37b03897a19855fb95e56c5c2cf10cd27dfd106ef25724b1b8681c07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and URL analysis indicate a phishing attempt.

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://crysiq.ru/uplcv?utm_term=download+grand+theft+auto+v+mobile+apk PDF link annotation
    • http://sziszolg.hu/editor_up/23142859175.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/boburojotevosofabobanoku.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/43486485888.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/finowituxij.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f033af7bd14f983109b3d0d1a609bfad/9758282939.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109170653504714.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/46440460561427a30238ee.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/84119671442.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/zimigepenazafi.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/93326523185.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/43604268206.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3065443a7---36497082051.pdfIn PDF document text
    • https://susta.vn/userfiles/file/jijerukebiwepewemazuki.pdfIn PDF document text
    • http://biomehl.com/images/content/files/nuxamuvufunujivikoze.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/66707416244.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/491f09264e9143a3d2bb7ccfc720e428/gevikufexopod.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/74170489749.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/pipabazilajomirusu.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/36989727599.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303ea6b164e---xudobusuderul.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4aa941cd---rodolimap.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/93748389583.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/67476745003.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_off0000d586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD586 17648 bytes
SHA-256: 06b592d8ee72d26deda62a4c05ace2884b53acdcac4d977648e518ac4f8bdb48
font_01_sfnt_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 11264 bytes
SHA-256: fe6a0556277eda2fdf6b9f025c992bb4c7a03395f6cd81f2d59922e8caeaa0c9
font_02_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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