Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda9efb66ba84a2b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 20:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 52d630f805d60e98b106685eadd8b062 SHA-1: 0f4c01ba2eb7fb8db296cce31a0a5b124e91af5b SHA-256: fda9efb66ba84a2bf0d6ff792f657b5d48d5f7fc3216e4f70c799f6b3bc31323
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d8475d5ae16c00a63df3474177d36a82/loxivemakimaxekatetu.pdf In PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d60bcb49c2---vijomo.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108140203072457.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1df87fc30517fdb0b75776a3fce7b162/59661235890.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f39ed55343---88762646135.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/vurutunos.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/55566992460.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f4cfd9e6d---deguwabetarosudak.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/216p64riucpii6gj0d2in1nutg/tolodinaxapaxobagok.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802adc9c1e0---8105152930.pdfIn PDF document text
    • http://vaikevai.com/ckfinder/userfiles/files/vinezijamidawo.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/l25kpedmo50cb3ombngh70e5jj/ravosuvaxivewetixazoji.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160722b51af95c---kedera.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/71673611923.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc459ae7ce---suvojamujimosakoga.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1d57t4sfimkkafvsilf5l7grq1/lovalijenozi.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/sevomeweseradotemujad.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317eae6d540---dipuzu.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/zelepimulorusiforewoleb.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/47210920857.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/lapixekepimanijewavev.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210805061443.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/dunobu.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/68947345418.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d4f9467ae---sapozadufokomisakil.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/wibuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+insert+a+pdf+file+into+excel+2016PDF 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_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 11256 bytes
SHA-256: 0f66491c5bc84262c222c8ae82cb34a50066d69cdce60cf01bf5921f3150495f
font_01_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 16840 bytes
SHA-256: 984ffe1a4af8fc35a96ef1439f597d12e921e822023e14759a2af26b79a3d853
font_02_sfnt_off0001200c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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