Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b6f78f316d3339…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 18:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60627516f09567ad0e064a4cf275045a SHA-1: 0c1667bd6d44b336278592b8e1746b351a938a4f SHA-256: 24b6f78f316d3339633a15c064d9914d799f074fafde8c6e4df8abddee9b32f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://jtravel.clickis.kr/FileData/ckfinder/files/20210913_D9DBE7081D3C1CC2.pdf In PDF document text
    • https://swaarm.de/app/webroot/upload/files/sizesejax.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/52348250443.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/64537252488.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/kobefolorefelujesijexe.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/fojem.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/65104039375.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/tosusifipuniwo.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/gagivamamax.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/82866716636.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/zoniwezesubawub.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0f14f2f9b32def0445bfc19a180ea52a/1180706023.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/nadepoladelumeniji.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/74475981252.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/19171822357.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/gisinazizefuruganus.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/kewakugorafomajitewemabor.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142d5eb52e3c---labifopeki.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/josafagipipewore.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421c8799fbd---6124070936.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/24721436028.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/vitawos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=memes+app+apkPDF 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_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 17524 bytes
SHA-256: f38c176a5fa20b90e677ab71428c4c9dbd7e2888e3fc1f5d1591cacc36199aa1
font_01_sfnt_off00010ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA9 9936 bytes
SHA-256: 33fd166b21e67a1ec1a0fccf3b5caaf16b1022cca52aa985d7cd441765a00d2f
font_02_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1