Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8ae1ab5a6022dc…

MALICIOUS

PDF

95.3 KB Created: 2021-08-19 14:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68c3b8eec4a7057e387e583243e8e557 SHA-1: 5f24c51a445e071de7744ed591604fca0149c580 SHA-256: ef8ae1ab5a6022dc4c1a00e40df0fe3a35b077021a35e8681d54c925a0681da3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. Numerous URLs were extracted, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly implies an attempt to lure users into clicking them, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=oferta+de+producto+ejemplo PDF link annotation
    • http://mini-garden.ru/userfiles/file/vinobakesi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1683c1427---livaxunadosinake.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/u034984sr091ol81c4fdkllpb6/kokid.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/12335028655.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/a6l0mj802rojvq5ililtrngl87/84357104656.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/97840059657.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/86891938617.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/wufowuvi.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/fumomukumu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd53043ba---80198862472.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/jelunuxuwof.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/87128842044.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/lizarisedukovokanujazumef.pdfIn PDF document text
    • http://millecolori.it/images/file/6297144281.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/3831287030.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ab64dddf75f---2447683758.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/kuxoli.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/19966d5f568cd04229cb3feb4f94d82b/22911908309.pdfIn PDF document text
    • https://ntc-container.com/upload/files/naxifujosibofawugodagu.pdfIn PDF document text
    • http://akhsmombasa.com/clients/861898/File/kegojogaligevumis.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5g6qdoc2c627brb0a969or1oi4/40789406577.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/jelubebemimesodepotol.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16112d91f296e9---miregulufele.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/17481633767.pdfIn PDF document text
    • http://gibisch.com/files/files/63721042328.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_off0001110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 17900 bytes
SHA-256: 2e2cae1fa79e37b21cbd7d68b9c891d2a61ee709d8d098025117ac7481f94248
font_01_sfnt_off00013edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F2 10672 bytes
SHA-256: 4e6bf8e54c605aae9f4f6762fea55ffb80422527ad2051d2391305b7da5e69ea