Malicious PDF — malware analysis report

Static analysis result for SHA-256 4917770626236236…

MALICIOUS

PDF

90.9 KB Created: 2021-09-05 22:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90db6f45f5fe4958c94bc8fb285206c6 SHA-1: 45321a6df4633957e080bb834d5df2c7db017b1e SHA-256: 49177706262362361c872c7c1966e8c1e82df7f277f54981245bee763fb205ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/te4ch7cuv9kkniqilnlgm0t8bo/jazunazijudatanupazo.pdf In PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vfi4deoci6u0kntg3ha5u1aef0/vixowid.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/o3h43r13blsh8cpqd3i7hmmon0/49860072748.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/satebozoxudin.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/nekenulu.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/18d4d1530620701aa001b1b9fd0bf6b5/tetuxowenibapike.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3b6tp84o7to4gi032m8eu1fij3/gegup.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/defufilewexut.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4dcabd2174---23165472375.pdfIn PDF document text
    • https://norservis.info/files/files/80322331999.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/bikuzelonukomibenetiwa.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/xojinolub.pdfIn PDF document text
    • http://skupka54.ru/upload/m/26626814104.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160718dc022fae---kikakevuxito.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4be35a737af389a075ee2b74ed787fdc/99237097723.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/10133671121.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e705262ae7---10580996699.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c95a019b8---tiporojuduj.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/bogebidejofolajimutamisa.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/16205561490.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd6ab74bc9---jadabafejulomifirujutuzi.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/37c8fe8cdf7a3e7a3e902245277db1da/36664072669.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/birapofukodonumona.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9bfda28b848ac73790c1ca7188187816/90638101182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=obiettivi+smart+pdfPDF 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_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 20508 bytes
SHA-256: c55b642c0c1e56c5ad21889b00260f014e9c9696a500feb831ec9ba64c5ce60b
font_01_sfnt_off00012e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14679 10620 bytes
SHA-256: 143f4a6ca8a22f979d5290d0df18aeed0497bedaa36e3b962ecba1b9233fd4fe