Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f1766ae6f8cc9c…

MALICIOUS

PDF

122.7 KB Created: 2021-05-01 06:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1d4e9fc0d3aa0bfd56935c2abb1fdae7 SHA-1: b467061e986a7fdccfb0f93179b52008b62836b0 SHA-256: 68f1766ae6f8cc9c43c32b6a31b5ee5a21fb8f5c9aa09bc4e876dd39f898f200
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear instructions or lures are discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/6jl5n045c9qa6mqkkplhu29btm/16918606969.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878b71d0f22---4969357690.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/74a4d87322b302dbafa753555df2f079/75798810658.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0afb0166d---19280349004.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608398587d497---30877489175.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1ae4f5a69b64938be95570be8f0944bd/patubowiwamegurozovav.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/81b713379f6ea7a0b0d2dd6b8aeecdb0/naropokudasire.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ofs1vu2odtomqk0np7f2i8t6g6/vonomil.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee8db3d6f---kozokitewetafapunavamisen.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ef2ee9cf6fb9fa9a13d7c07602b00860/samepojusipinadikaju.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/0f290d0f7bfdd37634447520a06341c2/10471642489.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079f91d5d301---93000342053.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0f6035595eb70f9dff24efafbfd24ad2/winuxiw.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8206c00d---zunemozelibibegu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0de91791---foxusino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=balgeet+marathi+video+free++mp4PDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB5 4744 bytes
SHA-256: 97b76ca996831fe23d2beae941d784169a9a64e0a9afc0f53db5774669704844
font_01_sfnt_off00017b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B40 5472 bytes
SHA-256: 1353503265dfb8d72ff61434d532a22cc1fb0d2c91d7188fc31b91246df63631
font_02_sfnt_off00018dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DC5 13192 bytes
SHA-256: d4f47e6e8f466e5653dda27c81c070f2d6f8ab6bbff193611edf4272d94e1e90
font_03_sfnt_off0001b85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B85A 16276 bytes
SHA-256: adbf4363a40851ac096ec70415ded39a38c3e45dfba4db727a5867e1fc988b83
font_04_sfnt_off0001ce30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE30 4408 bytes
SHA-256: 6b69afbb871baa0293ae1a2bbfd56f9d734259b63c4a61b022f3cd468c98f83e

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