Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50daa0470550f12…

MALICIOUS

PDF

86.5 KB Created: 2021-09-14 11:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 77b66a64bad3fb78f307ebe8a3d92d6e SHA-1: a57cd3be9403810ec090e702be1b591276961e31 SHA-256: f50daa0470550f124a5f0e1e6bd423ccf1b503a38dc142ffffb5c51b18d4b07b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://hide-bo.com/img/tmp/file/33452850670.pdf In PDF document text
    • http://cbstav.cz/file/dubetoja.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/jumikanamadatuvalodador.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9734f4b4ff139896073bae8c72967090/gojenazevosivili.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/pitag.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/gogidamikurojekinuvaf.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/bekimevudug.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/s2baogq88ugns50ienagoafg5j/balemadaxu.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wizakedosebusidoda.pdfIn PDF document text
    • https://beautydent.hu/editor_up/61595377176.pdfIn PDF document text
    • http://atomleasing.ru/media/File/76637290476.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090604275134.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/5317594505.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b61d385b57---20914805405.pdfIn PDF document text
    • http://rilta.net/userfiles/files/68239069837.pdfIn PDF document text
    • http://demkapi.com/resimler/files/53241119998.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109031829002496.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/texuzimivaz.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/50495088253.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/faretal.pdfIn PDF document text
    • http://slsnn.ru/content/files/laledikokaxedupinedosasam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gta+3+save+game+100+androidPDF 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_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 17628 bytes
SHA-256: e0ab892fce787d58a2d460aab6237f2e04051f2e934570cf562dcdce80df307e
font_01_sfnt_off00011ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 10996 bytes
SHA-256: 8e095298fc3d768a2a7c6311e6d5debbc8ad11b777a163ba8d1cdf9dbe335371