Malicious PDF — malware analysis report

Static analysis result for SHA-256 c089f0643e878494…

MALICIOUS

PDF

526.6 KB Created: 2021-07-02 12:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44482e167a1ad09837393b05a8d86389 SHA-1: 47a9050af44f9aa9b74cda43946f9116410a064e SHA-256: c089f0643e878494c499ddf81a7a6e3a9f9f2d49fc97e6a99f554baf02b8257a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the use of link farms hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The embedded URLs lead to various domains, many of which are associated with compromised CMS uploads, further supporting the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7947

Heuristics 5

  • 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.
  • 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://dj-venci.com/uploads/pages/files/25344273839.pdf In PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/61919549804.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2a0ffd89419f90496bcb6c33a6465e33/60421318396.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f0a90b401---ledowomaru.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/qhe51lfeiv9bbp2dolpm6bgh39/81856981221.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160aeba37b915d---petubimobebimavodafapakiv.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/muxadifo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/24c198c1d38722fd819ceed07c38f4fb/xolokewobevava.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/852f42c8b35e97df333330e2bdc511d8/45720929914.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/zuxizuzo.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/fededimedokifug.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/tenoxa.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/korosizifetubadaj.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/4dfbcbbd313e34aaaf955e3480ce14c7/41530780307.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609894a7bd011---10584802096.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4878dfab1c6c2e54b67da051ab7e181e/32692174691.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f16528beb55631bcb361d1b601e1a953/40703766385.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/la8gamj1r2lku715iqnneviuj4/marexagujumovirerovi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/8725ac816bc2d6c3955fcf34779f7a19/39142193157.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1f11e9a5f318aa0e414443a2bfc3d5eb/92679377821.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a63d74d8d5---vokekajijamoviveparika.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29da660102---95331656327.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/jli00cqotljvu00fc7un5uf691/rurun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=a+multinational+corporation+is+a+company+thatPDF 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_off0007c6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0007debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEBD 19624 bytes
SHA-256: 1b32837d751aa9592298aafc019521a0a6efea4128b50dc41660b625c65a2a16
font_02_sfnt_off0008121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8121D 10700 bytes
SHA-256: a9c4953fb58d94f7ac1a80d9e38cc483e634809fedb9ac75e8f39ebf7aa4989d