Malicious PDF — malware analysis report

Static analysis result for SHA-256 8212f28cb5ac6ba8…

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 12:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b27fc9beb62df75205405418dc9f7581 SHA-1: 112549f433395d9c3efc86e4b1e472deabfeb01a SHA-256: 8212f28cb5ac6ba81eb407d89665ab4abc78261350b2aa92ed80c455e9c793e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable binary data, but the heuristics clearly indicate the presence of external URIs and a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://hfengly.dk/skoleportalen/userfiles/file/9740770358.pdf In PDF document text
    • https://taxforce.nl/userfiles/files/vedadig.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/fitenorubax.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/pamunotolemaga.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/rukof.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/66534650909.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/18166049561.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/36892511506.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/k6sl5fsk70mj2ni8au5v29361r/juzolozifike.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/zofatip.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/wesexinoguzogixukojewetep.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/viredazaluxutuzel.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a18c97caa---tinarodiwejef.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/37445516448.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/64531331035.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/83056802192.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/zowulemode.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/94677389846.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/m0tg6fe64ls6jil94bmo0vn9e7/sewukizasogigetefo.pdfIn PDF document text
    • http://midel.me/userfiles/file/32554949427.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/60301692714.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/tarupoxevide.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/db5ed424a57cd063f34ba3dde4bb91a7/lisop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=electrical+maintenance+interview+questions+and+answers+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_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 18344 bytes
SHA-256: bc9082210dfa4be7cea3ff785922d3a4bc17e055e2e85d3398476cf208f17d1b
font_01_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 11160 bytes
SHA-256: 2677a32b721e291873a37fdc057c375a1b0df13a890a6b5be6a1da8dcf1a58f1
font_02_sfnt_off000130c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1