Malicious PDF — malware analysis report

Static analysis result for SHA-256 37dd2f869ab6e41d…

MALICIOUS

PDF

89.3 KB Created: 2021-09-08 00:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d46e893a3afab70e107fc1ea0c93c02 SHA-1: 2a6c03592cd19e6229e36e3d37cd0699eac7b60a SHA-256: 37dd2f869ab6e41db520acadaa8d1801588c6c91e933d6f85897d8bdfe4fa888
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other unknown hosts, strongly indicating a phishing or credential harvesting attempt. The heuristic 'SE_PAYMENT_REDIRECT_LURE' specifically flags this pattern as a high-value business-email-compromise tactic. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://marljivo.hr/userfiles/file/15428417304.pdf In PDF document text
    • https://bushregenerators.biz/userfiles/files/tepidewelixepobazewupidud.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/10023677864.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97f28d2169---10552701796.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/allhodqu97d19u5l7hccf7ellq/74629308211.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4baafe399b---vuritapakaj.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/71172297512.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16092a60b266a5---30557419509.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/lukuxosofigosezi.pdfIn PDF document text
    • http://krzeptowski.pl/file/sogetuduwizuku.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/gogavatabefojuverimib.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/r08it461pjcpn1mppate8q8769/kezipalopafazafogab.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15e98502a---74580761762.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca1f1659c---jefaja.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/taruzijegesapuviduvu.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/1547926471.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609058b2bcf71---vinisesorazofexegojagumi.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/mulutelo.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/14826301853.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/guzibelenuramurozajob.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/37642404991.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb06f95f58---55841185469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=network+layer+pdf+notesPDF 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_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 10668 bytes
SHA-256: ed4198ca19b19721882678d28d2e1fc2deb7f60f497e23846b0bb28ea5c87a2b
font_01_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE8 17456 bytes
SHA-256: da813cee25c9a6411ac3ac921549ea9165341d9df02dce601168b03d9029599c

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