Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c1748733a9a2ea…

MALICIOUS

PDF

87.7 KB Created: 2021-08-04 04:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71b84a44e011ed8cf9e9d04a19be2773 SHA-1: a447cc2cbd5759789c85af7749c162ae605b6ea7 SHA-256: 99c1748733a9a2eab1d73aae55eff10247f776d49d3ada22f0c05d245da044aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded content suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5300583b39dde4394c65790d75e7ade3/10914416749.pdf In PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd12ebe803---sofajun.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/mkii5o1cq7m871qds3e00jlqf6/25223066328.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zikezudamozaleku.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/zitixe.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/rokexuviresudila.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16105c29b16d87---liwesedabiba.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6ca7388b7a5c44f15388e9f0065e4942/wutipafifuwipuzow.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096693e61e97---wodajapikodop.pdfIn PDF document text
    • http://kfbi.ru/content/file/kasunimawivaxif.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/wajabux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b33e5f045---15825037413.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c4e0c53c8---80305509035.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/36611668773.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/dunavevixemusaleb.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/44410751895.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/mutona.pdfIn PDF document text
    • https://invest.pl/userfiles/file/29696915926.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/91608382566.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b78e9649d9---wetinuweganawuvizo.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/07a8b57859244b267930ce6af9b449c1/90451425288.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2b35d50e---18065393070.pdfIn PDF document text
    • https://andrejc.si/files/file/8393328202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+much+are+305+cigarettes+at+dollar+generalPDF 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_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 17692 bytes
SHA-256: 238ba71094551fff3912fcd2eb244012445d53a887040d3c4f2443a00114bbbe
font_02_sfnt_off0001334b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 11424 bytes
SHA-256: 62fbafcaba1e38066b7e3bdfef469e1d4870540bc27d895c593bad70d3b53f1a

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