Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0530fdaef70e6a…

MALICIOUS

PDF

111.9 KB Created: 2021-09-04 08:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 505861fd0f5f3e838a8ce72f280170dd SHA-1: 6d9e5a66d74aad585742c591109196d473f931f4 SHA-256: 9f0530fdaef70e6a0b9b8d656ba060cb89cc5eea3146c0c96ae9c5ca7ece9dfe
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 WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://paradisetourkorea.com/FileData/ckfinder/files/20210621_9C3F9DB8F3C1E8DD.pdf In PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9e30931b9a---pibewigetadaja.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4ae9e23db---29019257791.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160af6b1d39c0b---75925725626.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/54004070720.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/32fmblv7apsqm4e80od4tnf3lk/mudikedawuxi.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3af4c07d7---wipuvakemubebedabisawa.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/galokavok.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/83498875595.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/u3tkdpdkojmo7e0gkcnt3sdmv0/51617231972.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/10034518109.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/dirudukimabarisebixa.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/67220478536.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210710/file/16258650596843.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/91413674482.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/42v5pjrtuvu9k6es4b0tccf4s6/mekigozatosolu.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/metapotejuvor.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/kakigarotul.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fleqagfvp1pa1q0rj8t81phjui/28547570591.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/wilararujupaj.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/5392835453.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/defiguvukivonag.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/88719164009.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/sirapufuseropadigiz.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210618135604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mood%27s+median+test+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_off00014d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D11 10540 bytes
SHA-256: c208ab68b3c71c5fd859e2e6567d41a4c45f96e15b7ffd29272e4ca3b2818b89
font_01_sfnt_off00016515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16515 19892 bytes
SHA-256: c31f4d26a503decd43cbdc7700351e59309615858d6f0d2a8c6c9b15f5bd5979
font_02_sfnt_off0001999b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1999B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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