Malicious PDF — malware analysis report

Static analysis result for SHA-256 2157e25000f6ae2a…

MALICIOUS

PDF

69.0 KB Created: 2021-09-19 20:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 405d83029294ba2d1be58d3ae97cafff SHA-1: b7d1f9597547a9659a1398269961b9f418da52c5 SHA-256: 2157e25000f6ae2aeefd0a32261683e842cc5e0b79805ee9dc48edeff995ab09
184 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised websites. The heuristics indicate it's an image-only document designed as a lure, typical of phishing campaigns. The embedded JavaScript likely serves to execute malicious code or redirect the user to a malicious site, while the link farm aims to distribute the payload or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 0 text block(s), carries a click-outward action, and is only 68 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 http://kientrucphatloc.com/upload/files/zaveg.pdf In PDF document text
    • http://location-venise.com/italie_documents/files/makimamozopowaxozujatux.pdfIn PDF document text
    • https://sinarwaja.com/account/files/5264170513.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/fotajelolinarikawa.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/72340924698.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/vibumagitowal.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132908c9ee7e---dubijitexabal.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/40314839162.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/19415165052.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/ditoteginujivaxowijuwopi.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/9567182436.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8e89b18ec3f6edcb9a5b00ac2e38403/46293618358.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/jogujawuxifosafu.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/s7f87ng4lup17e0o51tiok0pri/17130303660.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/83900092733.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa294f5af---wavivawiwipudem.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/goduzizupipusozazufap.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/sodawasasuduwusakupije.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/pakare.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/dinifawusekutupe.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/zujasovotevi.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/49614002860.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/61228032629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+make+utorrent+download+faster+on+androidPDF 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_off0000b26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26B 10784 bytes
SHA-256: 84f69d8044a9db41914d87aa0cf01936c0763fd712987f50b66a57f3cebbd468
font_01_sfnt_off0000cb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB36 13976 bytes
SHA-256: f867eec32a7d058b59eb20aad4c41b7203b62dbbd210f740cba05ab11be7f5fa
font_02_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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