Malicious PDF — malware analysis report

Static analysis result for SHA-256 6437c683ba6114c7…

MALICIOUS

PDF

85.0 KB Created: 2021-06-10 09:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f6b2d3897232cee99f4ca073eb8db149 SHA-1: d3d5bd59797e4eff7bb91a9bb30111ca8fc1380a SHA-256: 6437c683ba6114c7d56f24a55d1e8ef4724fb364896feb07f6968e3988f17cf7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to compromised websites and a visual download button, suggesting it is designed to trick users into downloading a secondary payload. The embedded URLs and link farm heuristics point towards a campaign distributing malware via compromised web hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://ketchas.ru/uplcv?utm_term=international+neuropsychiatric+interview PDF link annotation
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/edda972efcfbf87e1b62afe87a39605f/14083640616.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160701e0d707b4---taduvifiti.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/85d5a6ab7d04a67b68c12d3d6fb63877/fixarawinokez.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/efa0d436a60e9f987a7c349b5ac976b8/15504226172.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d415bf9c4---33696774875.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef2863c6cd---91723624755.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070f5f13be97---lowosobekexiviwoxa.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160998e3f5104d---xosaput.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/48120938949.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc3a90ad3---79882124297.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a53a472cc94e416a7c98888b236b82fd/89090815269.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf6023f937---97735011209.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/npje11d8c6a46cme5o60n0upa5/46436335685.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0989f8c9c87eaf075489b75ac485872d/50818908997.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/22105476269.pdfIn PDF document text
    • http://sns.hu/_user/file/3148038340.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a423dfe8bc7---28713574230.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/witebonijatipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 5212 bytes
SHA-256: 2ef6780ec06710f49e63e7a8f28d7a8234b139690404be257fc1021acd958de7
font_01_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 11348 bytes
SHA-256: fcee9dbbf526d5c6da68e13ec6a4b7a5c53dda5341b25c286b39272e2030b7d0