Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b02a4f4cffcde77…

MALICIOUS

PDF

87.8 KB Created: 2021-08-30 09:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f4dc076ee320d14bd9f10a85e2debd0 SHA-1: 134b7c3216054b492f6813e1bf3c1dcd75142805 SHA-256: 6b02a4f4cffcde77ba80a099c24383e15fb58883580574233696777914b21e0e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0eca487dc3---noxokogek.pdf In PDF document text
    • http://vejwun.cz/images/falawugorakorapuwi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac6ff7ecdd---kizewig.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c49fa8878e---64302500276.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/47174080013.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/5g9voqng8074eh3ffjc3vqa6j7/zusepafakakiv.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/lqq9g43g5rpkpelsh5uf03hgne/paloripojapavugoto.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/739351466f6864a8fc8baed3a004fe37/55703183307.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9875a1305884e93b6c91aa8ff2c41c7e/lutimifatafonejusemigeze.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ff92da26---fikerove.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/66932976630.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/tumobagaferurelowel.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/104108330560b06ca9b697a.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/27829618845.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741137ca49f---49308803457.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/lexufivozuxizodakapuwar.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a6755a6aa11dcece220a2d47a8443c20/zifudilozujasigalotuketa.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/72396593565.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fbc6860a0f5f7b89c27de47c046d3f8b/nadapudejuxitugupokemat.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/33404701084.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f37242b0e70942d21b2cdefe43defe8a/25369072011.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/wizivadumeb.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/koxixesesageluwolokatuz.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/69087f3747b17a6f144fde1db76c72bc/soregodefevara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ares+to+acre+conversionPDF 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_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 10224 bytes
SHA-256: 54363dadf6e3d3f12533ebbea968f72c9543cf35332fe532b29c7f59a2dcaab3
font_01_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 22468 bytes
SHA-256: 8739b6ab4a76d716a4a56a180f03f3eff155f151fcffda4940248762bcaef2aa
font_02_sfnt_off000139a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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