Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e89b1a7ddf4658…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 00:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1ad995f41c1b9ea30252ce0ce41a3da2 SHA-1: 1bc59affb1384ff7aa72751575278a11254b7c16 SHA-256: d0e89b1a7ddf46587b702a65e033425fcfebcaf359fde56a5e4448185cc4038f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm designed to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the extensive use of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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=6+multiples+of+2 PDF link annotation
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/42698f827f722a7c698dfd44b6f5e982/49231863444.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a988b530d23---faxusowukakizogubom.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2697fc0e---mewipigezokabugipeme.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed7be87eb4---buseloluzefi.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbindqpv54avue9hnv95qf5l9n/71158111232.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/tjkj34s2bi57jti7onucqmfr26/bolaxinovusalotef.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/bi0h8ejllc1drteiq800r6f2q4/16064828933.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608712d2a1f14---xoxosevabovogaw.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vu9va9oebm2ridhjapvnhbk7o6/bizopunoxiworofax.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adee1ac5a5b---zirojidezasel.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/qa7633ke10qrffoespodp0j1cj/2089249416.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/lumodufikire.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/23995280011.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6a32483b0---ledusoni.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/48496107590.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/29223759648.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1pmi08r3ug1oacq15ej4tpirm6/litotijapesasos.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/takuze.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a4f7ecb368caaed35a8833c40f2bb2e9/xajixumoxugudifemarezoxo.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/voguvikelozojus.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bea8ea9369---39780546450.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/888dc9b70c87a7d55e75d381eff3c711/sisugasotefepugobaxujo.pdfIn PDF document text
    • http://proxima-design.cz/files/file/lanujigirarujizexo.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_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 16284 bytes
SHA-256: 034e0aa663cbd5089d06fb153f78354d14b66adbbb04ff0c61d1759cb0ddb30b
font_01_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F3 10444 bytes
SHA-256: dc04c773c88333f49313a8531281b2cd379d4b43680e95977172202475adc837

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