Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00397fc4d78ed96…

MALICIOUS

PDF

71.1 KB Created: 2021-06-04 19:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9376e6f5eeaa72094ca92bfd0afef41b SHA-1: 8ffd88020c80f69b82924b52875cb2e16090c760 SHA-256: c00397fc4d78ed96ad84be92a17ff0436e2a9ca76f91acd074c9c7dc3448bed1
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The document's content, disguised as a Dungeons and Dragons guide, is a lure to encourage users to click these malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://huntic.ru/uplcv?utm_term=dungeons+and+dragons+5th+edition+dungeon+master%2527s+guide PDF link annotation
    • https://securityguardsupply.org/php/uploads/file/mopumiwek.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/24632732511.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/42h2a9mpbcpfjcjohrd8po1bea/tepesumu.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/mabizalilutisojuk.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/aaa52d27ce2c1b51ef25f0de56103580/nadipu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2cbef16d1---31251290005.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d3af264e7---dupupuvipaluvenamedamakub.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/25480761513.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0a5e0171---93619019053.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f5af3d478e58db5ec4cf531a53b0462e/koxolilapikemoge.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/b9sapedb8bvfm9c0ovji3k4mfe/vogibuwugetivakazigujebul.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608808eaddef2---liriget.pdfIn PDF document text
    • http://yuha.be/_files/file/86226720940.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_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 5364 bytes
SHA-256: 59132af0de12b462502cd02f8084fcf9317dbe70e935afcc1c351abed51d9260
font_01_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 9996 bytes
SHA-256: d493804c2c4d35ef4c87946a6e1e1d4dcd2c7a58f66b08edc89cab12ad8cc768

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