Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6feb8349e1cbcf…

MALICIOUS

PDF

78.2 KB Created: 2021-09-23 22:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ba13d0c2c090653c99a86e2572b856c SHA-1: 61754756c813c35e6995a7a19f4820a914d80487 SHA-256: 4f6feb8349e1cbcffd7f22fc431cf97809fbf6e5c7726832b0acb6e6c785f6ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document functions as a link farm, directing users to a variety of external websites. Several of these links point to content hosted on compromised Content Management System (CMS) upload directories, indicating a potential phishing or malware distribution vector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://daisytalavera.com/userfiles/files/12672437720.pdf In PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485ff144130---90916810698.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143c37f458d5---nujurilu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf9d13b8c---xalumed.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/luvilarineloduxibenogir.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/8698575079.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/xosizuzagodulogujego.pdfIn PDF document text
    • http://cascad-trans.ru/files/56578136407.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/kijigepupoli.pdfIn PDF document text
    • http://levotst.com/uploads/files/42416199790.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/45013162912.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f9b3b62a2---bajefem.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/pusabopopiwodezajibafexo.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/22653445390.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161485faa76d83---18588302650.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/47449817378.pdfIn PDF document text
    • http://klpa.net/userData/board/file/xopuxorarafedu.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffacfd8b53---50042684932.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/65562119252.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/42372323972.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/gorukazota.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/nojupixavimitadokomu.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/18561128341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+check+recycle+bin+in+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_off0000cbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC5 17896 bytes
SHA-256: 7c325f62c0ca15ab9ff166fb3f8e121ddbe6421101d7f92f612d498aa81c70e1
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 10724 bytes
SHA-256: b0c4e16e0212408d64ffdab9a5ec874acd22ca9b0ab0219685e72162753f8ec6

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