Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d11dd3b10898c4e…

MALICIOUS

PDF

68.6 KB Created: 2021-09-16 00:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 748994ca3c75978201b84454d6222bf2 SHA-1: 2f1a62e84948d091331e6cd1fb5e015281757bc6 SHA-256: 7d11dd3b10898c4e37ded8143aae4d67f637c22bfcd381cd60c04d6eca83c8a4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites or download further payloads. The document's structure, with minimal text and a single image, strongly indicates it's designed as a visual lure to trick users into clicking on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cructi.ru/uplcv?utm_term=gta+san+andreas+100+complete+save+file+for+android+download PDF link annotation
    • https://luckysurface.itweald.com/uploads/files/614266c44eaf0.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/dufowoxitev.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2035a7ae103f0282c6d6ad1a1561f975/mudozozibaxozofuxado.pdfIn PDF document text
    • https://everestart.com/images/stories/file/pivizavejuba.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/66644646978.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423196dd947---lawilozew.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109100510502278.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d158337bd8---misudiru.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/13364914932.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/sumana.pdfIn PDF document text
    • http://nhabe.com.vn/ckfinder/userfiles/files/61184279323.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/buromaxirukepifij.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/lafupazupatona.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/25473375136.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/majepepen.pdfIn PDF document text
    • http://marketingnews.fr/images/file/kobipegesofil.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/56523113271.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/vigokipoji.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/fajololonitofidinuw.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0905/f2401c43beb0978a5824bb4ba974bf86.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/39149856583.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/jofopevijaxu.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_off0000af4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4A 11144 bytes
SHA-256: 36a89d920f41df2cd0567d89805490ab99243c85c12068f9d62f3fd1750516f9
font_01_sfnt_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 14060 bytes
SHA-256: 66a8d467fa61c4c861d5de64c02925b631a64b6d826c790cfbaaca8e28cf0f8e
font_02_sfnt_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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