Malicious PDF — malware analysis report

Static analysis result for SHA-256 2756bf9951004a09…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 02:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b7adb8dff0e048bd50ba5dface4aaa0 SHA-1: 341ef7539e3769a86addc147c0b22d30597918a5 SHA-256: 2756bf9951004a0925559e8ee0caec8cabab1c3f456780b0f70c9a8d91d26706
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The file contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.milestonesmn.org/ckfinder/userfiles/files/nemevadulisuwililube.pdf In PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/31137550730.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/nsotdnnqcph9u2th115181h03k/592944046.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/56952699704.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075b93bd942f---67142843352.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/3e4167c8996d5c8de9ee7c6429d0a770/bavova.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe230ebfaf4---50979240654.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f02c7878ced551cb28e01e7adc0139fb/2051702403.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/65961698933.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/nivatudanomij.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/r27b0fhjd9memidbvqq3ks46ji/zogakiladejinedezuxi.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/gurud.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901b794b696---dixudefebowotowogur.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/94968850271.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/73183487319.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/16883622924.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160757484406fc---dejalixinoragixokivibi.pdfIn PDF document text
    • http://voijin.com/userfiles/files/94714069207.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16225595572056.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/58352779100.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/xusezasosojafejudag.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/somit.pdfIn PDF document text
    • http://aps-mes.com/files/file/resarapewuloguvezazex.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/dojewopitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=delirium+tremens+libro+pdfPDF 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_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 18900 bytes
SHA-256: 61dee77a1f23de6004fe05f30e435be515be753f0c8da584f2a8a98ddb239636
font_02_sfnt_off000120fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FD 10736 bytes
SHA-256: 82e222aaaf425fddfc029422e3694bc83a5959a552b255d5b2b7ec1e32ecb6de

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