Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e360da635b4493c…

MALICIOUS

PDF

69.7 KB Created: 2021-09-20 21:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10a193301ca92ab61fbcd64a0df51139 SHA-1: 06938e2c75f73917bc92ca76e62b0b8df94b9b42 SHA-256: 3e360da635b4493c6b39f53fe9a61c179e45c697bbe9914e01f983760456748e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents attempting to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=how+to+access+internal+storage+on+android+phone PDF link annotation
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133184018f1c---vudukavonorolumumubudoni.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/36362875812.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/46452195765.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/18581397508.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/38515970947.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/tezum.pdfIn PDF document text
    • https://fishboat.hr/files/gudap.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/logeka.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/guluduwosigavutitowazixe.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614815ac567a8---74253503127.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/86516023839.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/golegafiwogonifaxanibed.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29054669164.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/46872923147.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/daniw.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fijomumarugavinone.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/texajatekova.pdfIn PDF document text
    • https://jurad.eu/files/file/wosepuxolavunupapug.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/5503353228.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/92862800191.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/pudapavomulozupovel.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c6ec7087b---62691860759.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/penadepewe.pdfIn PDF document text
    • https://noddy.nu/images/file/wimewolinura.pdfIn PDF document text
    • https://labelmarket.eu/data/file/10267971528.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/gisugaguv.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_off0000b354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB354 10872 bytes
SHA-256: 726a61051eb6bec11eb834f4fd2f8c7d4a1a86a534f3db847cc92306ccf07e51
font_01_sfnt_off0000cc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC29 14716 bytes
SHA-256: e51178154629323b1dfa5c80dc0e69073194fbf693c56d1bbcd873503abcf08d
font_02_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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