Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eee64b018be66a1…

MALICIOUS

PDF

88.1 KB Created: 2021-09-18 13:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e38e576c4585060ffaa101caf2d42568 SHA-1: 7bc73f104dca019442e21758106c6c32db7fd85c SHA-256: 7eee64b018be66a18c6c22e4899c1ed29071d61c9f56c184d422f10f4b4c61af
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'download button' lure reinforces the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • 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://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/8297352101.pdf In PDF document text
    • http://tcgardening.com/userfiles/file/2021091300113273499.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130dadf6f04c---41274092342.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/46727501293.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/waxuresubewoluv.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/gubemasonuzusesopa.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/53085627612.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/nodavilonoxugunuwujevi.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/duretiwizedi.pdfIn PDF document text
    • http://autodilygood.cz/files/file/mugevapuk.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc96e18854---25804621309.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/36267107999.pdfIn PDF document text
    • http://ndt-ultratech.com/files/pususefamepiwalod.pdfIn PDF document text
    • http://czyxchem.com/upload/files/wetuloximelogepavitidi.pdfIn PDF document text
    • http://kaies.cn/upfiles/2109092001232805649ndwi5.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1614328457b772---relovoturig.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/dinodozisutame.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/27130804715.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/lezaxenuruzugorupezuzedox.pdfIn PDF document text
    • https://kaparatt.com/images/File/fidafis.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/gajogidozebiv.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/kujabakulomuke.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/22922964451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mo+ra+walimbe+marathi+grammar+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC921 10892 bytes
SHA-256: 635fb704d330c530f71367fcfed72e88f4d15fcf5325d99350cd88ea8b9b3d36
font_01_sfnt_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 22204 bytes
SHA-256: ca003ef8c44fb0e323e6a965423449ca82b43042b047cc6b6a5cea44fbfd91db
font_03_sfnt_off000123c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd

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