Malicious PDF — malware analysis report

Static analysis result for SHA-256 949d6fb1d4fdb4f7…

MALICIOUS

PDF

84.8 KB Created: 2021-07-04 21:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe029210db5ff9aeb987766c8d744457 SHA-1: 1e3bf4390da98fd965ffe79453570de0666e6145 SHA-256: 949d6fb1d4fdb4f78319872e5138ac493b5b74e2c7689a34778c274fdda629cf
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous external URLs, many of which are hosted on domains that appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as phishing and a trojan. The structure suggests the PDF is designed to lure users to these external sites, potentially for further exploitation or to serve malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/9j8ej3udp9b9hbi1j5epv2ju2c/dunaxepitota.pdf In PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/478628dcd5e35b81f4aa9b31f998d09e/85869602244.pdfIn PDF document text
    • https://samtee.com/admin/images/file/bomamijexuvikuga.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/44106317463.pdfIn PDF document text
    • http://naucseto.cz/storage/17586005596.pdfIn PDF document text
    • http://goref.ru/files/file/wujemezozeva.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/tefutuxuluxododox.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6641be6a22---saxidunusogasovuzitas.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/8461272045.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/28493042945.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a314f6264e---dafoduzozafinapewuwimeta.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca76cb291---80653215069.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/nufupew.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/vabusapozig.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6fc6382908a3dc235064db669a89a758/48039563797.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/81072935079.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd01cb797c---davulosoxuxogoputavomuj.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081f39606667---40908010586.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/d743vd0bogl532asssi270p8ii/nugeriwok.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/7e7d53dd05ae023f71b79201fb4345a0/94073516211.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/xabome.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/8225259444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=chemistry+general+questions+and+answersPDF 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_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 11172 bytes
SHA-256: 99410c50aec4137f19d849d464ce5fa42d89ddfe8a0f4c1d3d462a8c969a3e86
font_01_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 17644 bytes
SHA-256: 29e14710a99f588075593247e9ff64083f6c14cc5418f05ddf97a1648b3560ba
font_02_sfnt_off00012c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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