Malicious PDF — malware analysis report

Static analysis result for SHA-256 6284ab647688d602…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 10:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c00feaf32334427c8c7e3078a257e57 SHA-1: bcb8c23ea181206244d147ef5644d285589468f4 SHA-256: 6284ab647688d602e7b3721606675f5d8505bab82686802207d026857a8fa580
164 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, employing a deceptive download button and linking to numerous external URLs, some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=minimal+adb+and+fastboot+drivers PDF link annotation
    • http://citysoupsbellevue.com/uploads/files/80323817910.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/9953339860.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/webesevozewajenedakavuzo.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/56117604877.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136ace3735c5---nomuwoxujuzewedamabar.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109111633109225.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/rugewogobibudububozazaji.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146a1c0d73be---guzizopeposuxulodetowix.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/dixudoluposanovutixibo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144a4c3020c7---61494918992.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/zovikifuwo.pdfIn PDF document text
    • http://e-menu.hu/editor_up/mavuwepagavope.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/92746014005.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/7156447049.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465f7380038---99441187733.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/79926656177.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161312efb1aaa7---sakexararunex.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/tizemefagoxemomafowo.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/bifarinefo.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/bozakurefakafogexolasol.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438af6bdfd1---patozevuturu.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/85030615334.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/dimegazinisowikurimo.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/tatujolamujotomeravek.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/lawexuzebikowulupenijo.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_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 10712 bytes
SHA-256: a84699b57371b85788386bee0661bf1112e4d8ace57bcfb861595105e60f428b
font_01_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001140f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140F 19356 bytes
SHA-256: e778919f0e411af0f9ad4a2eb20f3e231f138385c54372bd03627631ac0ef157

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