Malicious PDF — malware analysis report

Static analysis result for SHA-256 233fd0ae895c264c…

MALICIOUS

PDF

71.1 KB Created: 2021-09-07 00:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68f85193b1f130d90c0122963ce86c3f SHA-1: 529a9aeb08dfc4def1fe0892cb2521963fc106d9 SHA-256: 233fd0ae895c264ced16a4dd06b1e2f047008bf132d92c757eb49f10e21e2576
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the execution of malicious actions or redirects the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3gm85c6n7ftl206g3mqaie0k3n/pitakaxazebaxunapoba.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be54fd7d036---lisavoximesot.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5226efda---bilefubasulu.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e68450622b242fa480fff188b3566cd9/gerilawelizetunumazir.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/busaxaxinodesuze.pdfIn PDF document text
    • https://triosms.com/userfiles/file/19325977594.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/minotosike.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086adf7a4550---77659048293.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b14c544622fa61e296fcbcf45c8ed048/togokojelidogevubu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c990c0a946b---kimomev.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612191e65bcf7---24507943989.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609806d089343---rawepobazoborenalegi.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/30204676984.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/90740829689.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/tupar.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1d77b7a24100753d5a7e4f7d2f9565eb/73503688845.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8ed82b12---62582573769.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609845f258a35---nibononopatisadeja.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ab811858a1d---24384027895.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fade2c63bc---rawesajisoladifitoj.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/xoruludodubopar.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/wakijifapemusexoj.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/kadizoritexugulabi.pdfIn PDF document text
    • https://seerupit.dk/assens/file/gevuwozarozaz.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/fab1b4f5375899b02585f26463c50673/zasumoxonedu.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/getatuxepixofopix.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/4747172986.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/nopizemokeduxawutimitozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=esl+bogglesworld+fall+worksheetsPDF 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_off0000b8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AA 10736 bytes
SHA-256: 6767bfb17559819c5499d949a5ed456ac855ea544760553b536e2cbc3607f36f
font_01_sfnt_off0000d164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 14524 bytes
SHA-256: 2c5a0eba4990be1ed09a8c3979b87dcd37a8a2d8d80aa07b122b53a9a2c1a4b4

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