Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3be355cc1972466…

MALICIOUS

PDF

67.5 KB Created: 2021-09-26 15:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b523f77eceaacdc1ff29f291b38bdc4 SHA-1: d3f51d5c6442f45c2503af98b9ff317ca7734380 SHA-256: b3be355cc19724661ff6febae528fd72b6d9b1b8478cecb1eafa36eb861d66c9
184 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and is designed as an image-only lure, typical of phishing campaigns. It presents a screenshot to deceive the user into interacting with a malicious link. The numerous extracted URLs point to compromised websites and link farms, suggesting an attempt to redirect users to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 2 text block(s), carries a click-outward action, and is only 67 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://infrive.ru/uplcv?utm_term=fifa+15+mobile+offline PDF link annotation
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/tenamuzuresixutemog.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/87e501c48cce24ea33529cee860d412a/zoravafutifi.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/3f111f147a7dcb5a0b64c830fca7c430/bapaxex.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/9254581721.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tamowi.pdfIn PDF document text
    • http://balalajka.nu/media/sasivowigafumidosukadudo.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/90213551607.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/58261530813.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130140b7e192---49323558868.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/ganofebu.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/tanizezuduwurojaz.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/poduvujepabo.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/54bb5b7639c6a9bceb48b79a9eb2e95a/22180983810.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/bomixofoma.pdfIn PDF document text
    • https://mar3ol.com/Files/files/bowokakegopusasibajotera.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/gukugipifalulexajavarazud.pdfIn PDF document text
    • http://186086.com/upload/files/dodaruli.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/kuletom.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/patutuluzuforibufowa.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/buxumaxupo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5bfda41de0ae28b19fa75adc4da8287e/wuxin.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f420a444bf---welag.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/84562543564.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_off0000ae14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62B 10312 bytes
SHA-256: fbd7b3b9d396861e015c73ec0f42a6049be8574b1c3e82784290b0ad80bff623
font_02_sfnt_off0000dd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 14168 bytes
SHA-256: e00dab2945287a237187c23612d82b5ff454ee551bc77573c07ea837f54a3977

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