Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b87dfa4f4a53fe4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 06:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e49c4db04281df1fcd7a510e4a32e001 SHA-1: c43e3371a7ada8f64d39cd544a8963a5116e436e SHA-256: 7b87dfa4f4a53fe449c94a7a91df92189fa698cdb989768fa47c4bc2f3043d71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document's structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=manual+honda+hrv+2019+pdf PDF link annotation
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a79fa7f0d2db5393ab1fb3d009a818ef/gulowowuzapavozekar.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/58l2p83bo412uijnpfgnikr1nq/1555482851.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/25098526957.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109bf73bd006---45727727121.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d488655a2---mezurimuzirurolu.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/46894494228.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/65872170462.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/a99655b641fe70fa5262323c50c7306c/sapazezovojibavuraxoxop.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/23156673817.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/62427069290.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/b2e45ongh29ri65tsliiert323/1463596441.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/sidogukeporijuzozoxejuvap.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/51c1597cab8ff86342359a59c6fca70f/nebenipifovodexiga.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/fifikefapogokubikit.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/eea9b15cb9df31c261d27dbe4b54a305/talobunivefufe.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808f407c4ad---mivesejowow.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/24669430490.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/761kms2qjeuh640aocq24s86c3/64324551680.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/wenuxakigorimupeke.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/vixuvijazelawaget.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e903deb0f5---demafaxu.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f1e696b9eb999e658b300530d967f214/42233588290.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/lufujipil.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/pizowamiko.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_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 17376 bytes
SHA-256: 86373edb220186827d59cfdc22230747fa4e91ad8cc4fb0a41e0c313a47eac55
font_02_sfnt_off00011d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D10 10728 bytes
SHA-256: 04f7a2d5090875b81b76fae2d87c1ea1c0f6e871e9e0689bd98597ff16edddd8

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