Malicious PDF — malware analysis report

Static analysis result for SHA-256 750ff7aad6799add…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 21:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be4539d0ba85e635accb0e61d8d4c0d6 SHA-1: 2fe2ef94a8c7c17d9fae9968830ef797e4fa7e45 SHA-256: 750ff7aad6799addbed94a71b3b1afb64341dc840047ebdee96455958132318c
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely used for SEO manipulation or to direct users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=medicines+that+cause+hyperkalemia PDF link annotation
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e0299b7127bd4bba3b269d94a3c6788c/94477498951.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/53a478d5eb0a750460701bc930b265da/wisasaso.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774f1976850---sisaxobizeduwofu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/92057090950.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210613_025249.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/36f1c13f21bb01fb229730af7e881803/sefekegokijugazute.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfc36d94c0---80357479039.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4547174b60---sadazib.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/47376604504.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jlbk4moiuch1lqdadpitovpjjf/29651700838.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ef734ab77d4675a3aa6c6803bf842e23/kixutujarepure.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/99603943201.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/68615345080.pdfIn PDF document text
    • http://primaneighbors.com/userimages/dumapawunuguxakal.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4879f8638a01f6d79c62501be328dd65/82910474892.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/95b196c3317c189221e5333e33eefd9e/76674386858.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2afef6d5---55485708059.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853c7eb82b8---88027136424.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccdd964d3f---59088672035.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901fcaca713---rorikop.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/55203887019.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/73905880732.pdfIn PDF document text
    • https://temahr.hr/files/94417995415.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/dp3jbe0hef4qbm9divp2ka8no3/26849775150.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_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 10956 bytes
SHA-256: ad94952469574e688693e18bf08884013c74f7d0a963b351793120fcbeae8f81
font_01_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 16824 bytes
SHA-256: c91b03db99cf13ba7904745c8191381083fcebf8a78f7f61f757ba21d2042472

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