Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6515a0189e47947…

MALICIOUS

PDF

78.4 KB Created: 2021-09-22 12:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f53899d467e8d399498f7ba791f869a SHA-1: 636b4e2f4205fd2961e06956af5151dc2d25c4a6 SHA-256: d6515a0189e47947c5a05153ad3c088b37c13f3c23901f5494252a067fab4139
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV heuristic strongly suggest malicious intent, likely related to phishing or distributing malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://hzbmsj.com/images/upload/File/vulemuzitixenudotos.pdf In PDF document text
    • http://salukool.ee/upload/userfiles/file/45536090064.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/24867341673.pdfIn PDF document text
    • https://mikludava.lt/images/files/34562008798.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/lilejuvununefuwipit.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/86400156265.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/bapubaxesovofaviro.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/jafitoxowadiboruzib.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/77794376051.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210920_131515.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/dotunakuwofasarugelezij.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/14987855941.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/21723881500.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/83425540533.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/26132198325.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2984f1f97943014c5615fcedbd13eb32/wafipesasekidemirabumi.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/34822785236.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/dopala.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/walemivipojenozomewobapez.pdfIn PDF document text
    • https://fratellifurloni.it/file/9726370837.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/rubuvubameradadivizefuko.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/121c420ccc07dcfb123b77a2ff11d3e2/35346414234.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144a7e4e8f73---70655558407.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/nibeviwelilonuzunolaj.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210917_4FA40DA56A5AD131.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/novisesepujumabaxivorogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=german+k+wordsPDF 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_off0000cd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 18260 bytes
SHA-256: 16c30a5b081d583507d2d9380c2b16e50386f8be56fec69598e09bf77bc3747a
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 10388 bytes
SHA-256: c88f26345a05411f41ccc74bbe60ca1d3417dd8aa25086656db30cdfa9e19eff
font_02_sfnt_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1