Malicious PDF — malware analysis report

Static analysis result for SHA-256 94446f27ccdda8b3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 02:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f6a5772bcc16f057e8bd9f79bc7bcafe SHA-1: 70a0360d511749a67ac52b11e63e561121706be6 SHA-256: 94446f27ccdda8b3e7b1fc33e42d1422f75067c71cf491077da0e8b0e909efcb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these link farms. The embedded JavaScript may be used to further obfuscate the malicious redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gdlqp096b6j3flffk4s6qg7317/ladetaramezatuwi.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1d2gd40a1di88q18ul16d137sh/56760764196.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/kinujesubiboloxurewav.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9a3a659a6b06d75f4a6c100e1d32adaf/sabezaxovugumowu.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/82651006270.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/61726412682.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/96800736880.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/11966694184.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/gujojejasu.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lodagidu.pdfIn PDF document text
    • http://www.heksan.com.pl/file/34927696765.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/teao7t17cunbkurupater75n7c/55468934851.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ef2a0a983---faviforakasikoxagafafirat.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/nuzosutaruseketebatozen.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5d86794c---44232053679.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/48738456439.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/64dd5d21d4a4275bcf31bbd63a0bb7fe/32921737849.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18791d9165efceb3a5da2fee65491f88/sanotujoxabekezilazosuva.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/51585650576.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/gikemaro.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210516085828113.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/9450706116.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/60923376925.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/tlu68dhcuq4plcmrc3qotppaok/98061585206.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/susavuvepu.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa62486da9---22816725272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=encyclopedia+of+sponge+ball+magic+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_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 11004 bytes
SHA-256: 71b44c448d43d43e8f3d0b7a756d9814a97c458e4cfdc5476091888426ae3361
font_01_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 18276 bytes
SHA-256: e4adacb0e1ff4d4b1c455c10ea167b33e4debe4f2ce6a027198c33fd957b8620
font_02_sfnt_off00011db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1