Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cec9350e14154c…

MALICIOUS

PDF

72.9 KB Created: 2021-09-01 04:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcca28ee242c51bf6eb99a374cc3b041 SHA-1: 593a437cb5c0789292da308f679b90c71b13a132 SHA-256: 81cec9350e14154c273fdf5081c587ac3994fe1ab5d7b18c1bf51e69849899da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage 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 delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=fast+character+builder+d%26d PDF link annotation
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c55430c30adac5553e792401dc3cf30c/80722065094.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/rarumuvutizud.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///11625484186.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/dkp32mh8717sa099bohha2kfs3/rujobi.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/batip.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210623034747_1zg1r2.pdfIn PDF document text
    • http://unseretochter.com/images/file/metotavove.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/xegabisamupu.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/nasudaxigu.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/zivexanakutixade.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/29399885228.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/rivupelatonakiganesixuge.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/94017666653.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742c88a7756---vijotekibikatipepimabako.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d767fe0ede3---87460192638.pdfIn PDF document text
    • http://princeverma.in/uploads/files/90541429107.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9b1ad682---47940271520.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/00482ef8b5cc016969ec7fdbd93319da/75847475139.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/6b47c367ff533941f4ded7860927486d/15311878443.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/pajug.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/zabobi.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/48595085361.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c77eb125284---48735021145.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/93295042189.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/bugowagikilaj.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_off0000ba02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA02 10460 bytes
SHA-256: 9daf1fa095eb5fa698ff5dbe1f3436ff120a22bdb1272d2c33b7d66a7fad0281
font_01_sfnt_off0000d1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D1 16932 bytes
SHA-256: 6da13bf54307fb6336e94e7c0398c2f87828526cc7792a1747052216bbfbb614
font_02_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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