Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6d9030d6606088…

MALICIOUS

PDF

84.1 KB Created: 2021-07-23 10:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 707337002726a1ec4bdc9b177af80c14 SHA-1: 0e862d54610af4a46a1fe33b05204641334b8c41 SHA-256: 8f6d9030d660608870bf7b69bfc20cc8aca5bb949923470e83f19e27802ab926
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using non-clustered link farms on disposable hosting, which is a common tactic for distributing malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ytovietnam.net/ckfinder/userfiles/files/tigibi.pdf In PDF document text
    • https://ghnservizi.com/file/87754660666.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e1ed29c60---39753070449.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/9386a800ceea953d18c029c0364e3ee9/91861986543.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6412a1cf3bf3119de06fbf06e54a3e9e/roxosojula.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c973212cb9---46650740018.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/tuzevupoxuzalusadezagol.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/68372751244.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/14707753458.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecad7f3723---88578629970.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/lukoloj.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/vawizapiritibo.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/32497521072.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/jixomebawof.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/lerigapenaremaketuvuxo.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/7559093016.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/satumijaxorala.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ab2217eb6---dikizoribu.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6bed10b917c82abf21d3cb575620be26/zogorira.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/36dfdb39aecb05dd072d86f797eac4e3/52537243954.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96a61fe92---30794909162.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/rilipekabamew.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705727975a9---25088078627.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/95c63b1d46a83744d9aa255318730a81/92488325091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=adding+fractions+worksheet+with+answersPDF 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_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 10868 bytes
SHA-256: d8ddf0ad48327e93d48ac8f52c615beb3f0db928555abf8bbd71527ea408e15e
font_01_sfnt_off0000ff94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 16452 bytes
SHA-256: 0cb9a1f7de0aaca2a424215cb1feee97ee7de6176b8d5abc8e863fb25e3026d8
font_02_sfnt_off00012a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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