Malicious PDF — malware analysis report

Static analysis result for SHA-256 7659627484b64816…

MALICIOUS

PDF

78.8 KB Created: 2021-08-27 17:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c140a993717f95aacbf7d196ec6e0ae SHA-1: 98d2e9f42806a43d49dd86da82f08fb92243c1ab SHA-256: 7659627484b64816afe089831cd42e0a80230d5d020bd8138444b81b41853666
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/31gdicmhokg8j54b1e9hsu0jc9/nofojaxagudoviz.pdf In PDF document text
    • http://harasim.cz/uploaded/files/pejivani.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xonivujoda.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/5348071031.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/29180665183.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/f8c10b36f04a1db9679408c8ab84d865/28922789634.pdfIn PDF document text
    • http://xsteelstock.com/d/files/77730330501.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/49562542188.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/sonuru.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/lapelajun.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/guwesa.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/4221686402.pdfIn PDF document text
    • http://mytaylormadefamilyusa.com/clients/864113/File/ropilobubaxaturote.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/jaxorabesuku.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/73522591077.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090a75c626cd---bazaweronem.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e25eea7c4300621fcd9561ffc8498f0d/sazefenukumubugafeden.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/14911250650.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/dusepenimifudabuxi.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/46256795553.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/70902621662.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/76825222370.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607691dc8f559---84061208564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=that+i+should+have+bought+you+flowers+lyricsPDF 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_off0000cada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 11120 bytes
SHA-256: 5e545b823975a36c9ee742e00bd80aa340032753df9ced13a3cd570a728ca14c
font_01_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 18436 bytes
SHA-256: 3403067cf5934374f92069fb7a2783aa9f23e64c1838fc8625426f91fff1868b
font_02_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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