Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cbba0facd65b34…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 23:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a697be2242278fa71202d1429b1210f3 SHA-1: b55136c0e13c89a7cad34eba5ce16d8028c3f03e SHA-256: e0cbba0facd65b34b4a48175c18c69936cbacea7bf1a711d580b709179d00d1b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ankurgroups.com/userfiles/file/dutanubam.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/94171792ddc63e6877a875eb0de751b2/28751178838.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/78722911738.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/jujudunegafuzexamefowo.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/78235501237.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/74005877013.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/gemasalilipubol.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/2070026055.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/bivefe.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db9f726a37---38039011317.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/47531709556.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/pizudaf.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/tekavozikikokewikolim.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/66664226307.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/21096478128.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161366d3e5f33f---81086256249.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/nurutijojanidofoburima.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/zukomagegokozetukatituko.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/nuzorozukop.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/38971458765.pdfIn PDF document text
    • http://coffee33.ru/archive/file/gapev.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6dt12h84q1f237hqjptcoj04fc/bevotowafaliwixuvapeku.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/25852820722.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/24971712535.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/66401481039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=up+time+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_off0000ce41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE41 18116 bytes
SHA-256: ca32b89e4d8dd9347edc866cdcbabf7307dc74b0177146f9acbf931315af8968
font_01_sfnt_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 10344 bytes
SHA-256: 5471544fe9efa20829d6fb21a3b2c0f7c2c8098e8c1095b4f1fde2654a6a3b17
font_02_sfnt_off00011406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1