Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c5be04d5a3e96e…

MALICIOUS

PDF

100.0 KB Created: 2021-08-16 14:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3f017bd65c8b3441041ea16543b88aec SHA-1: 58deba7ff13bb2993e98dc455f36f9a65d1b1cb5 SHA-256: 66c5be04d5a3e96e8982c47de234ba99c9ad2db6fe1f5becf3ff11b1f084cc10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of a 'zoo tycoon' related UTM term in one URL indicates a lure to download potentially unwanted or malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crewmak.ru/uplcv?utm_term=zoo+tycoon+abc+aves+pack+download PDF link annotation
    • http://yuqiaohome.com/uploads/files/202108131416512448.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761674e644c---rubikamo.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/viripi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/364f8f4274739cacfd98e0436833eaa3/69984967988.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/35a35bce85e4f484799e0505710b3424/gamigegoxu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e61d1fd5ddb6843a96072c77047effb2/tururewinigukobibar.pdfIn PDF document text
    • https://airbays.com/userfiles/file/lexazokesusonijowefek.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/1185243667.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/nepedagugirevuloren.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/9ec57a2d61c08a9aa915c11886f04e41/bizagejiboruxegoxulepow.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7c86b4854e1ee657fb5740abd92e8f36/sozekonorolemefimewujiba.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/menilejimusubisulanob.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/13415335798.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb17d8a776---38566741604.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/48221228317.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080980ce3036---fevevijegukid.pdfIn PDF document text
    • http://hasekei.jp/userfiles/file/modisuziwabet.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/24475128261.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1f55b976---48103545797.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/1860884392.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/pedosikabadimitodubinugu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/01072343c71c007c32d453b049db584c/96865371069.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/552750063.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/c3a3f63efd19ceb622fcf2b768ab99ca/mifesogafexukorowekipol.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/zosonafejapofasuzekedap.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_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13609 19280 bytes
SHA-256: 9940cbdc7915df041b2f1e907d699d99666f63c545ed18656a635901f402dc8b
font_02_sfnt_off00016785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16785 10776 bytes
SHA-256: 60973a8625e5d5d42b3151303b41faeb527e8920b2c741a30894525048fdb340

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