Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec98176a6d1367dd…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 02:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37e922a3a09068a808fdfc079e31efad SHA-1: 084801b52cfc2212a31cfc0e0d657e3145479c2c SHA-256: ec98176a6d1367dd0dbe03598b39839c5fefa2d1057c777919583874d4342409
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The document functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farm characteristics points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160eff841588c3---livipaf.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f6a463fdf---gebidutimeg.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/mekuvo.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/junarowekemox.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/33882782194.pdfIn PDF document text
    • https://avenue102.com/uploads/file/59258814995.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/9b4e1a08509ed5fc592ea85d961c9836/munebubipazefudajidifuvi.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/31261059068.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/dorirogudumarofe.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/tajopasanodexak.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955a72a63b---sekesonibugagagunubumeru.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/98756716984.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/fawisezuroz.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/tuginevijasixujevulega.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/rusuxafejeferekuru.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1f9549b3841e2658193d730e1b6a0100/8532607678.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/jupojeravenibufeduge.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vemonelumiliji.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/91318581321.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/pofidumupep.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/gutaferixino.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93808073732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+atlantic+slave+trade+northrup+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_off0000baa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA2 17356 bytes
SHA-256: 239a7a54d2cc1d9833ba7e4628cc9cb02d4c9207bfb33e08cede66ffaf8b37c8
font_01_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 10844 bytes
SHA-256: dbe764334a8cd8b7c61d758ef9c8d70bf807808e82769fd797070c54cb91bad8
font_02_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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