Malicious PDF — malware analysis report

Static analysis result for SHA-256 5806f4c0901c7c51…

MALICIOUS

PDF

78.1 KB Created: 2021-08-21 00:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c2e3cd7e4929e381a8a016acc174f9b SHA-1: 3fb3501f01ebc2896b7ef3a9936fd72ac498769b SHA-256: 5806f4c0901c7c5112f3d2d019d0af964cea05e70cdae3980252e445ce7b1c23
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, pointing to numerous unknown URLs. The presence of external URIs and link farm structures suggests the document is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf219292d6---40837232408.pdf In PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/zefenefor.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3244e51c---xusapigapibaromafuxunot.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/divufewodido.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/95382463862.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/baxutuxote.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zetototuzata.pdfIn PDF document text
    • http://chira-med.pl/pliki/lubumozimuxomujajiva.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/menitofun.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076593226863---jajotu.pdfIn PDF document text
    • https://masukpt1.com/contents//files/gonuvowoxudi.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/62431654900.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/pirirore.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/vituvedovizeji.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/26ccc6a2bd9a59816bd0f3cf7b99c3f6/86085861812.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f84910cc3bd---lubugufijutovusafedumere.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f43dde90---rexevap.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/16538870360.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/kajipida.pdfIn PDF document text
    • https://efnnma.org/files/file/33441147055.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/nemutubis.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/2284802de10241cecc44e82a8689ad26/89085520178.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/51403977249.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a1077de7bfdc1943c4ad72d75aa4e791/rusede.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/48219797747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pony+creator+v3+swf+downloadPDF 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_off0000c180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC180 21760 bytes
SHA-256: 9327f544aafa6cbe8e6b173c6cf9e55e8a66f923c7495ae59f9d849d56a3c34a
font_01_sfnt_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 10816 bytes
SHA-256: 8e9d5886709ff03e0e7956035ae52be0495e733c6b31b4c666c72958e6df5ca5

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