Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa21c966badfdd63…

MALICIOUS

PDF

71.0 KB Created: 2021-09-02 06:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 80a613bb81d9e5e8bc6c80690ec0ddb8 SHA-1: 260bb115e71f948a7d566636f824422a93bf3402 SHA-256: aa21c966badfdd6389ddbfb96b1ac59cca34360af91a8b08b73e0e3d60cb0822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/979c70424f18fb9b2dede3023ac6558b/kodusa.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788a8930f60---zemuvasumeg.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160783e8d5dd44---tezinigiwo.pdfIn PDF document text
    • http://uhorder.com/upload/files/11895229717.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/40311112861.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d36f762cd87---jamosopijivuv.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/553ab9c7ea29b475e6441e40ea83a5b6/81746841100.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/bumidoz.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/14953000132.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/13685444632.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/69704577513.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/binagodobu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c9060368a---86087941390.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/pexorumobowepajozidegog.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/26393422708.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/81943005230.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082d803a0bf8---5563473512.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac24d7d895f---80294494853.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/96323870083.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/71183384220.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/95305581826.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/godagajawifawikuvim.pdfIn PDF document text
    • http://debden.org/userfiles/file/55874285938.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/javagubiwafu.pdfIn PDF document text
    • http://kd-council.com/upfile/files/lanij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+you+change+your+name+on+fortnitePDF 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_off0000b742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 10860 bytes
SHA-256: 2b5f840a472dee18afb1db55b5f8000fedcbfc06df83bbdd5996f023763e962d
font_02_sfnt_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 15204 bytes
SHA-256: e266532df6eb5279b811ad68374ec3fa1878351453c3d81662d4f864fd021b93

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