Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f609874a49552e8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-02 17:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d602c695dfba7d12abc3560ce68a74d SHA-1: 4b335e64835e75ae226074cb9901152fba665b8a SHA-256: 2f609874a49552e86f6fe7a4179580842b0d7f437d82b808f0337d5c17dff0e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/df8huvbih8qbsa4i65ulph2ob0/38111069454.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e4b0c322---feragapemufab.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607076b0bbefe---39697869991.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210719_74A0EA8B3015C23B.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/jumubadufiputuluben.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hkji89k8ijf6rkhonrmu6rieam/vonetedoxupinilofazuju.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/detuvenogasojijon.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840d35ac687---61344188100.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lu1vueud3pltnp0kev13osvlvl/83428545242.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ic9jp69oc6q4kkqqh900ohjcl0/budumelumaruvewagesob.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/latofazowowefujibuvavi.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/waxugofobasobibufivivim.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d13fe5519f---wameradezetikosem.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608257bf358e9---refijuwupixifodenux.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/zigopisekirupu.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/58622746653.pdfIn PDF document text
    • http://metabolit.ru/files/file/17746046865.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/93127961519.pdfIn PDF document text
    • http://pk.mo/userfiles/file/bijulebafanotaw.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09e21f932---85882524869.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde13f82b1e---lilizid.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210811_173833.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/78123970619.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/gajofabanet.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/55097269993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pr%C3%A9face+mademoiselle+de+maupin+pdfPDF 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_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 19024 bytes
SHA-256: b0203a0c46b218141e0943c0db14f2232227bbc4bfdd5c850cd80eda4bf714ab
font_01_sfnt_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 10940 bytes
SHA-256: b1e6b05cbae994a6d12bc4602e4f0ebc5de884e14113303fce44c57e4838263f
font_02_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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