Malicious PDF — malware analysis report

Static analysis result for SHA-256 f244f8143f6b6e85…

MALICIOUS

PDF

77.7 KB Created: 2021-09-21 16:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4df20c311441e4de6ad576dd9c950b8c SHA-1: a7b0cd7e784d42f8bfd2da4d9a945b807cf5515c SHA-256: f244f8143f6b6e8584b36b1c3884dbcbf675c8014338d3213bebff65291b0c6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The document's structure and embedded links are designed to redirect users to external sites, likely to harvest credentials or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://inwebjor.ru/uplcv?utm_term=minimalizowanie+youtube+android PDF link annotation
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zugirubetejakotukiramivir.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/gugagugolunozemoso.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614612f0b46b9---sifununixesu.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/wunupoxar.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/26746885764.pdfIn PDF document text
    • https://seger.cz/userfiles/file/lubore.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/zowefoxosudusifizovop.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/lewaluludupotitawiropune.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3opk8k6u5gokl6gsc3u9nmo8hf/98226241943.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/37479917773.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f20e8c23---20174643639.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091609145067.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/baturag.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1feb2f8fd991a7e6ba7987cae64a96e1/78621409497.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/mepijategifo.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/u5olseb5masag4n2280va9raf5/55108648837.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jlcs8vcnlmm7041qt6gicr8ru5/70553984737.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/vamufotimi.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/dilutirupuj.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631951521f08402b9900c49b50f97.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/4160630079.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4623fc1cf8cc0a0cc7b31ef4dfd6b74b/26296303569.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/gojusen.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/72297114804.pdfIn PDF document text
    • 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_off0000caa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 10736 bytes
SHA-256: 1f4dfb190e347b70e719b15471fa7fab44636ff865cc9015e0607b31d14e7b9a
font_01_sfnt_off0000e348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE348 17520 bytes
SHA-256: f232f21ecc3df37541d041aec9b77cc03d0dd8c5893ee45fe7b21e846052676e
font_02_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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