Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e86d233dedaa716…

MALICIOUS

PDF

69.0 KB Created: 2021-09-04 03:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6b31c17033fb4c3ee606ff7798bd84a SHA-1: b7017f8438353caf94b4c572479857dff9ce8d65 SHA-256: 6e86d233dedaa7168cfc327a187c68609d959748fa8965ea87900182fc4b8d19
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content or exploits. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially malicious PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate effort to obscure the true destination or host malicious content on disposable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/009e09f578b9b6be2eaa32a113f2f871/wesaxomewisulidezi.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/5cbef7bfb51f9343f178568c2d64da70/2513430783.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/28687362328.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e674fc6e---13041497494.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/wukumiwijedolixalu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/77c42na7gekn2anb6m4llsnnk7/48043282561.pdfIn PDF document text
    • https://limsurempat.com/contents//files/bazamisekivosi.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a58e9fd8f06---35510596675.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b2800da3d---sepapijamofunudedewi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7fc9d32cf---95264663094.pdfIn PDF document text
    • https://invest.pl/userfiles/file/89348684390.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/kupebo.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/baxovetu.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/27195818076.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffa600fab---molaxuzudurugirilesakabov.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/66542310971.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/43773645577.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/maxuzifijusop.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e504536f0b---lorokumotokijadorajavi.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/zuzazoduniwak.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/36397258931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=intolerancia+a+la+lactosa+pdfPDF 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_off0000b059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB059 10564 bytes
SHA-256: c9f0dc0a4c4630bdd1017f63d8f103aa0bd9f47b5afc4d1cc413d94fb6a64fc2
font_01_sfnt_off0000c887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC887 15712 bytes
SHA-256: a633511c3087cdcbd9beb28d4fef276af4a0967dd8d25b0212847d24f7419af8
font_02_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.