Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a6c2ca8b4603ec…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 21:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 205ba06200ac8fb2230ca31853cc4a86 SHA-1: ceb038e234833cd162ed0682f923a2fa55c016bc SHA-256: f0a6c2ca8b4603ec447e01c6093ebba663274e24cc2724e6a06d194e20e237e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://garglob.ru/uplcv?utm_term=how+to+remove+intune+from+android PDF link annotation
    • https://whatshoulditcostme.com/userfiles/file/2220142212.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/dijupiroseg.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/gipuvixafirufoxerasi.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/bepufopagilakefumakimosaz.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/jujosulajemutamu.pdfIn PDF document text
    • http://machin.kr/userData/board/file/981394107.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/56231917738.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/29312026897.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/bigesusurajenobe.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec6d7fcea---wufojokijexojuserabobaxe.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/giluf.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcead0ef01---sosupejat.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/32047112824.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/k3hbkupadol7nr2ia6sqpslfo5/tilidebezi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4htcecejovju9266r48g492pn7/bidiluwawimiwumos.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/faxoxabamozepemutasawixi.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/38427644882.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/dujetimeruxavukowomatonem.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/zerumokonavu.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bitegerasokoduk.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/38296861053.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/zadidovixukilipodogim.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/lafopum.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0af5295e416f95f1d409aab0931d676d/46392185162.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/3087367906.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/84294379797.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_off0000c717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC717 10544 bytes
SHA-256: 94e8a7fe64d3be9dc5f73b5dcb404a0818bc867ab28637d82b0fc6a9635cb49f
font_01_sfnt_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 17244 bytes
SHA-256: 7625cf47c8c8f9fbc0239e8bfde8a8008fa7179a797cb848282c32c1487a0b82