Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea32fe03cd5fd686…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 03:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49b5f6c10ad24f7c2033b43ab201328e SHA-1: 1a435b1a2863ea93b84dd96d88acb6fdd8213824 SHA-256: ea32fe03cd5fd6863aaabf33f0b23701888cddb342ca011cf4d8c74ca9e531c6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to redirect users to potentially malicious sites. The presence of PDF-specific heuristics like PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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.
  • 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=gem+free+episode+stories PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad8f0078e6---xekenutaj.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/jimufegozipulabet.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///50297472624.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1632002435.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/geserotev.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/tirobalokazisa.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/wotibafogiruduvudugof.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/84547133179.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/getuzurefotubori.pdfPDF link annotation
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4a0e228e8---wetufariluluzaramosikalax.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/perosozo.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/16333834439.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/91185894497.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613963f2b17bb---nodulokevezelot.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/59457852233.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bc3dabea2---68989121582.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/43259202625.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/74934980622.pdfIn PDF document text
    • http://expresskaliski.info/file/zipaji.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/61539871410.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/60618636373.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133eef6c5a1e---58433883662.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418a028fe3a---pijiro.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/fowegib.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/46598761885.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109042346515130.pdfIn PDF document text
    • http://salt17.com/userfiles/files/siruki.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_off0000d561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 10384 bytes
SHA-256: 527a790ba3d36c1a266177d4fc7d8fa8bcb299ff4782c7fc85bf6d8072ac7ee8
font_01_sfnt_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 17160 bytes
SHA-256: 057ada55a665fc4f8a80a77a3a452bab82dff0ff8f0150a260364396dab1e296
font_02_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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