Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf75044759710e1…

MALICIOUS

PDF

87.1 KB Created: 2021-08-09 08:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 82884aa0f6ef0f8efa4bdaf45176a25e SHA-1: 73f02eb6761d3d98c0747de1ab14c4f580ef072e SHA-256: bcf75044759710e148dfd9c7908acf2734f5f17062e0d832ab3b26f053f20158
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nowyhotelik.pl/userfiles/file/37288095775.pdf In PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/76483310768.pdfIn PDF document text
    • https://famecosmica.it/file/xozimidivesebukojujiru.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/memaboluvi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/7kd8gpl70jeu637h85q73pbom2/44795107121.pdfIn PDF document text
    • http://ciskmv.com/css/file/91682098035.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/67629188169.pdfIn PDF document text
    • http://remobudostol.pl/pliki/todolosomiwafip.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/tekegi.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/37883505357.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9da75faeec3a5a4f768ab6dc694e7290/106001336.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a834059c80c---26966009576.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/e4ab053e119742aeca7f557393c22a08/79874380776.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/53851385858.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c061bf6902c387407bf4c8d5a74075c2/41675495665.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/3306357761.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202107281558361710.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/28417778019.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/83170156965.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/xewuvubafafusugiwowobe.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81fb956886---31025585222.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/275431a33e9b961e188e1566ac7cbe33/luxaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=vehicle+inspection+checklist+form+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/gelokoton.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_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 16300 bytes
SHA-256: cd0f7b049c80aec1cd9b2ddf57ebb4149781b3d844f469e0e1c25ed5e5d82a7b
font_02_sfnt_off000134f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F6 10784 bytes
SHA-256: 9b92ec64f14e0aba077dabcff1e2a62f8e5d7c353bb26e5dc69b8f9a8aa6424a

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