Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e4a4ae672df9cc…

MALICIOUS

PDF

97.6 KB Created: 2021-09-05 19:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f247647a31bcc6dd4a0eb104436c001 SHA-1: cb12d8155851f8d2f94272d8bdb1e8e54af9ee52 SHA-256: 72e4a4ae672df9ccb0496a110e6987aa878fd7cf8200d7b2f69e3658e625e8dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a variety of domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://ketchas.ru/uplcv?utm_term=twenty+thousand+leagues+under+the+sea+pdf PDF link annotation
    • http://forglass.sk/userfiles/file/lileg.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/zuvilat.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/sepenofozekogoj.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/553047430.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b66cce0f3e---gasidivologuliwib.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/74358705353.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19f2941db---rituraf.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/sazutepefawivorox.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/sabunelejam.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/77743976543.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210713_7FC1AF74652A0B74.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/940dc500e2ac630f8e9b867a11bb3253/guvawelorem.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/pugaguve.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/48036109415.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/91214113247.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085641559bd5---gugogepowosupemoxumo.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/zotizagubibexazaf.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/a8gv62pgo1biafs3q61v7act1m/jutikese.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f624df60b81---85423454582.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/bapomibezigabikovotug.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5cbda53472---viwivusasepapevafumoj.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0618120241---lupox.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///dupugamotozelegelazo.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/6287d20bdb576351f11bab356e2d6b17/91027341486.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/wojesodefeb.pdfIn PDF document text
    • 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_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 10948 bytes
SHA-256: abe8cb61e6ea04781f0322103a173f00efa4b4375460c234ad8cedf963353d48
font_02_sfnt_off000146db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DB 19136 bytes
SHA-256: 21de24e8c0bea3fb5501234d9f20343f866c12ee0a913a04e1a9a04a27b3ceb1

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