Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b6b274f9937e42…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 10:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29ef4dfede5949ce87faf88d99ed28f1 SHA-1: c68e3d0ac70c92ce5ce8c4c0143d27051233f73a SHA-256: 54b6b274f9937e4287f7c4a5c2b37275ebfcfb4fdda80c55e61f79780b8d9267
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document employs a social-engineering lure, instructing the user to install a browser extension or update, which is a common method for delivering malware or stealing credentials. The presence of numerous external URLs, many pointing to link farms on disposable hosting, suggests a phishing or distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://irlanc.ru/uplcv?utm_term=flutter+build+ios+online PDF link annotation
    • http://good163.cn/Uploadfiles/files/81807247504.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/kagekutiguxemepizu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5ea51457---7956424215.pdfIn PDF document text
    • https://nexusmediation.nl/files/91633647146.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/21389581730.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/29726588677.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/70035756765.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/mefikipifi.pdfIn PDF document text
    • https://attack.lt/images/files/16412009458.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/23413903838.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/lesakofisip.pdfIn PDF document text
    • https://stormester.no/files/file/71154138307.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/guxekerumumerini.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/62183817900.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/75816567916.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/pajubujepeluwegug.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/59184321602.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/5659888654.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/81338001452.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb5936a441---46493898132.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/63837455735.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/damusuradobonukonajunus.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614334a4f0126---88684996275.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/niwojegazigib.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/93281318688.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_off0000b206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB206 16472 bytes
SHA-256: 68c6f7fe87c4f16a3a5ea0eb2a9b2469b39b46dea8ad52198003b95d0220396d
font_01_sfnt_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 10296 bytes
SHA-256: 5e4d7e982f7024bdd79aff0afdcf420e0804884188432cace633442eaf0ad63a
font_02_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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