Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a526bc98d6f1b4f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 01:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17e62674827f85a0ac0642d0e84fe268 SHA-1: 0bd3305c6e78bbc059bc34cd390efea9bb101a1c SHA-256: 6a526bc98d6f1b4fb346fca51f74b80cbbbb73b3038d0f85608d1921e57f8844
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://n3ss.ro/ckfinder/userfiles/files/vetovaxexitova.pdf
    • http://pinedafoundation.org/imageuploads/file/23449374928.pdf
    • https://lifeteacher.tw/uploads/files/202109061404171943.pdf
    • http://104408017.linker.tw/files/losoridurovojaxunewonifi.pdf
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/910752021.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140da4ecb8ff---loxiduzu.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/094ecfc7bd3a3cdf48acf488cb6a22c9/21904501145.pdf
    • http://lnv-cnc.com/userfiles/file/nofuwanevokawutexedet.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c011caeb6---vojovebexa.pdf
    • https://highendteen.com/userfiles/files/lamobomubuwejerixufowanun.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135795a974ec---53491467911.pdf
    • http://sportsclinicwest.ie/media/contents/file/51948075028.pdf
    • http://budapesticukraszdak.hu/userfiles/files/xogarimusiwefuriz.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141134711681---rifarelafu.pdf
    • https://alpinashop.bg/files/wexojuf.pdf
    • http://kunjipsc.com/uploads/files/86686838445.pdf
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/newovewapilimelidilarut.pdf
    • https://gastriklandsbf.se/UserFiles/files/33689020733.pdf
    • http://abhinavabhishad.org/userfiles/file/21467933378.pdf
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/lufenuxiwaxadavofatida.pdf
    • http://kkc1.org/htdocs/cljr/data/files/77350741401.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143c0c3ec60a---99714540778.pdf
    • https://jnnjhansi.com/userfiles/file/64846476936.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/51143870959.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4f57c6093f5c2bb32745a2a6460ddb2d/48025158168.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=clock+wallpaper+hd+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d924.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 16792 bytes
font_01_sfnt_off0000f136.bin
a66f810b93b77f2aebffaba21ff432ceb0a51ec7a3d8c9ca9550ab19b1ba6778
pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 17168 bytes
font_02_sfnt_off00011dd2.bin
607f68fcc33b3edcce646c88780cf9aa934b5a6ae68ada30080b432b5c51bb7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 10568 bytes