Malicious PDF — malware analysis report

Static analysis result for SHA-256 4856c524fb57d69b…

MALICIOUS

PDF

99.9 KB Created: 2021-06-28 21:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 15c220b365a41a545aebe4d3f810fd8c SHA-1: 567ab7abc604704cdfb4ab757eccd2b9061d3ca3 SHA-256: 4856c524fb57d69bd2c73e82df54769199e172fd8776202de623274f5e2d0b91
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://philabc.ru/uplcv?utm_term=give+weapon+knife+csgo PDF link annotation
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c5d8c5e8956---kezekenarobojuladubale.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/hnc17j173rpvovoven95skt72j/xudamoxolixa.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/jajokawepa.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f173a95ff---dizokalawinixisupewabena.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c55b06abb7---60921248354.pdfIn PDF document text
    • http://fabtur.ru/upload/files/8036340530.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/8c6p3e410f5nijk1lhc8ogams4/57659573550.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/jujilomi.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o2o8g3lqf2ko34mkdj5bvsonp2/lolevomoxoxerofibo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2de00f392---62488151606.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/lupular.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a024d348c---62790666936.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091044a35579---91072050386.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ca5eb12cd---80019309929.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/mabodofafujojulamotase.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/33j8t32jc20n47oooigfoiki4g/98780263147.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/89391efc7e100ebb87f6609d75495c07/debuwuraxivomuluwo.pdfIn PDF document text
    • http://metallpress.info/files/dupoxodebugaraxidanos.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/59770409876.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eff5c013e6---lanuludojusunasi.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/99717995812.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/56213632441.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/31405812778.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_off000123bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 17712 bytes
SHA-256: 114609ce1aaeff6ca9dc3ca1a98a6e362fd8f66f67f9041f549d84d08f18d0e5
font_01_sfnt_off000151ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BA 10696 bytes
SHA-256: c7be37de6f34824d5b0e001241c9bcbe9947fdbfec602a1339ca4feb9c6131dd
font_02_sfnt_off00016a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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