Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ce7520bf5e18e0…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 08:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 553a6f0ade2d600dfbc1351db790d36d SHA-1: 27027fc98427f023f1c6dd6f1338617839820be3 SHA-256: f9ce7520bf5e18e0c9101afc8af32f8994440539d59cf828205111501c8e97d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e76d04f6---25186396876.pdf In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/396efd3294593e18622b7fdd4e764466/nawitegopubijexizum.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/terelinulurikuga.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ec6b6b4659204235f2109d47c7c8fc99/nukidatata.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/53881555633.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/lavuwejeridav.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/bokakodojipifojivavax.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ah3927u9o22t2qc31o96ekv0l0/39805578847.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/faluzavaf.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/21604652336.pdfIn PDF document text
    • http://thaide.org/userfiles/file/fizuzaga.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/lebexita.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/60987120085.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b69319011dd---rilejinafiruzol.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/195af51fe93bd27cb2241907321f4848/fuwukosatetezis.pdfIn PDF document text
    • https://doganagolosa.it/file/gowedadupen.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/1b8505b0edeb2b3de972c9ee11cadbd5/wubusofi.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/xigudawasemo.pdfIn PDF document text
    • https://strechybenesov.cz/content/14745642330.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/1861203335.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/27f3aa2567454abece46448b28599f7c/fudupunutobovejematuw.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/15071260661.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///kipozunomekuxejaremuver.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/pvub0hjgdf27letb78vr96dk81/98740526141.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/zulufobudewe.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071ebdd846ae---nesaparaxoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ecotourism+articles+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_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 18304 bytes
SHA-256: 9106df568c0cfb1b2388d9da248ad52891654b9ea1c448bf641d2d51418e74b8
font_02_sfnt_off00013aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAE 10760 bytes
SHA-256: d0b9e129004f36e3aef2069dff1fe32bfd39601822b57ea7031e0d8f086fb761