Malicious PDF — malware analysis report

Static analysis result for SHA-256 0478391f06766b35…

MALICIOUS

PDF

82.4 KB Created: 2021-10-06 16:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9378d3f83a737d432f56938d1a3c1863 SHA-1: e536439c7045e44b0fc7e88f619d2df3fd563931 SHA-256: 0478391f06766b358f54f044dcfda73972ab733fcbff68c061d1c749725febbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to phish users or lead them to further malicious content. No scripts were extracted from this sample, but the structure and URL patterns are strongly indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8b0af9db---38360213782.pdf In PDF document text
    • http://benhvienlaptop.biz/userfiles/file/katixibusefavofelabidir.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/31939976183.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/losurozire.pdfIn PDF document text
    • http://hidramaco.com/files/files/88636319206.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/xipesi.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/28202062899.pdfIn PDF document text
    • https://eniedu.com/data/file/20210920171334.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/3968153061.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/82780771743.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021092609315992.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4c07726769eeef466fb945e370cd20f0/sowufaziworepaxinip.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615997c879807---rizaga.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/rusalalalenerofexaw.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/juvedezozemaxejinexulowo.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/jakofivoxalirojora.pdfIn PDF document text
    • https://maria-galland.ru/files/file/wajuwosowifuke.pdfIn PDF document text
    • http://baoveantam.org/upload/files/92767040078.pdfIn PDF document text
    • http://xfswchem.com/upload/files/digosofuz.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210903093316.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/xosirisav.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/59520482905.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/51147947640.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/3769262595.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/11364482701.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/31350519533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+know+if+a+table+is+linearPDF 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_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 19772 bytes
SHA-256: 11bba0b02467cef53b086480e3ed58c8cc0223b5e819394d6c4ea15f268e613c
font_01_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 10656 bytes
SHA-256: 6f276dc2772397b81a1dc4b530eb39912435423e1612f25788cd293c8cad2062
font_02_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1