Malicious PDF — malware analysis report

Static analysis result for SHA-256 f000b432b53e2e8a…

MALICIOUS

PDF

136.2 KB Created: 2021-07-20 06:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c6051e538f454bfa79d124dd979f79e SHA-1: 514893289e533716551e662047583c31c6980d10 SHA-256: f000b432b53e2e8aebef88d9fe01c487c39776440cac4740d372ba4bdd5e5097
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS platforms. The primary attack pattern involves directing users to potentially malicious content through these links, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pizzeria-millemiglia.de/app/webroot/img/editor/file/bidav.pdf In PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb407da947---xetevulotupasejemejawobux.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/56656101157.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b209e4eb2e---29605751519.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/37073178188.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/nofunojufej.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/7717484987.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c85de50f73d---53148707376.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/xewozeziseguli.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/77809174049.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/db13de76fe6972c61a4e6c984829432a/60255866193.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/87256926637.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e15fe71c2e---53866255943.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818e1db2fa8---8137048959.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/vubarakatulozesuvij.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b72cc948de1229937a7bf27bba932a2b/17700142134.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zefovosemifadasedevas.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a085cf09---koxivepuzemimowuzo.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbceac6b3---42729183824.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9c6dcb240---39705026700.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/laxezeroralomisidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=state+wise+crop+production+in+india+2018+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/dilajovutunonupetudeka.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_off0001ad94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD94 11328 bytes
SHA-256: bf63674c53f14b8ce60f640c6d48038525efcbc9ec99fe70d8ee5ac1aa8629bb
font_01_sfnt_off0001c871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C871 19176 bytes
SHA-256: 414f2107424115f1e8e5b2d09afb5cbfb0321fd64f6ff7bfb5a72b4a9f79b652
font_02_sfnt_off0001fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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