Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d683bca9ade222d…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 00:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bcc665c9aa5a1d4e53d515eff16bddcc SHA-1: 9c7b5e50799c4aa565622484bae102a456dd07c3 SHA-256: 9d683bca9ade222d37939c3720ff156181f2d214372e12f37f0530cf0a7e6406
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect the user to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=the+hobbit+gomovies PDF link annotation
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613397fd86efc---52512424326.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/folesuxafiwakazipetu.pdfIn PDF document text
    • https://wineart.online/userfiles/file/fenoxadi.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/kovexa.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/gulibamirubev.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/35275002136.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///56878334044.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109151237456862.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210910_160015.pdfPDF link annotation
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7a3bbd98---86886481068.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161450c4419f51---dovedi.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/xilamalo.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/83429784997.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/85552485545.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/falawe.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/97560418222.pdfIn PDF document text
    • https://seger.cz/userfiles/file/panuvo.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/lejideduvi.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/ritejupowemalojop.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/walanazosevasojogaza.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b20da2e5---95252198942.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091102122972.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6693e8261---konodin.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_off0000c350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB67 10312 bytes
SHA-256: 73553fa84df7c402b9b48f14a4ecc282643aac16059ee80b86b395e6fdb55402
font_02_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 16988 bytes
SHA-256: 4e6d33e0e672f3ce23b38a294402cb35dbeb960d5d07e4727793f656e17c021a

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