Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e65674438258f66…

MALICIOUS

PDF

72.2 KB Created: 2021-09-10 12:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 386b987f053d564675e8083f4b5c096c SHA-1: cdf17f9bc9e100fe621f4defabc2a750beb50822 SHA-256: 1e65674438258f66e42cdb613316eeb2fc191e28a0bbe693ea57ae577cbdd429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous URLs that point to potentially compromised WordPress upload directories or other disposable hosting. The primary purpose appears to be redirecting users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fbbde9d16b5fc8907339f13fef1da0eb/gorebijelezivunilusasa.pdf In PDF document text
    • http://mdsalon.ru/img/lib/file/kezenepakojavitekolevuru.pdfIn PDF document text
    • https://bfull.ru/uploads/files/455765181.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/72886892732.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/bekoxasiwefofadenevekut.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/4433992155.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/38ef1a3484f9b5bfc945dd6a5c1f62d6/10677100585.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/78777367463.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/6ghf37n9pfe2to50ru2n261ktp/65223760470.pdfIn PDF document text
    • https://trystsalonri.com/images/file/jozezorudiv.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/43929822565.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/52851692614.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/43059611986.pdfIn PDF document text
    • http://labsshop.com/d/files/nemulokadas.pdfIn PDF document text
    • https://gornjastubica.hr/files/baluvurunenisobilutixurol.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/keweponipu.pdfIn PDF document text
    • http://baove24h.org/upload/files/93613453139.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/tugebimejodovu.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/14882936516.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/57363832346.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16135da416ba96---31208791437.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/82600389722.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/mijegorutoxilejatixasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+stanford+prison+experiment+123moviesPDF 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_off0000b6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE2 16496 bytes
SHA-256: ba2efc2d6466a8766fba2cbe891a70698edb60834a1d1c390ad4be17a4c4d9de
font_02_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 11192 bytes
SHA-256: a1c7c95e923283b400e8d759d9bcee64bf1c50a2c540756065a5c55acd32d37f