Malicious PDF — malware analysis report

Static analysis result for SHA-256 251ce6e20e8f465c…

MALICIOUS

PDF

94.1 KB Created: 2021-07-26 03:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e00c55468401b758de49010286e98983 SHA-1: 20e5f64ba1a2c2d8be71ba34f0a6182b4562a157 SHA-256: 251ce6e20e8f465c4fa7d34453cac461247841b163474fbf2e0062dda70c34d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the 'Urgency/Deadline Lure' heuristic point towards a social engineering attack designed to trick the user into clicking a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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 http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/11fef09b72dc2c04fbdd7bee4450bc96/50086013506.pdf In PDF document text
    • https://banderlogclub.ru/Files/file/semiguvofefu.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/jelabuxaga.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/ae449d24ff4b9a221d87abd13aff5da5/gezureveramigugik.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/wutijadewot.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/tawaxaguvaxovapodepijim.pdfIn PDF document text
    • http://juentai.com/userfiles/files/doxesinowixibovo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b760fe4e6b9---jobudinexu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097066527fea---72003070182.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd37949362---15885900815.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/gefufabuzu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085caa715454---videjaritonuwosojizonixo.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/lugilajof.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/gesevo.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ce0696bdd---vazikopokaxoraviteme.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711c1ed9328---zinibuzosipixavi.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/44206819243.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/84191812304.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/57252834414.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60c5bb1c6e464.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c84da538bab6153bd769d447f9002c0d/ronodujejeleleramesonel.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8b96cb819f2a29f1987845551161530d/18968269561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+a+dummy+flight+ticketPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/91ba53d424e39668c07d14c2263db12c/dejituzo.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_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 10932 bytes
SHA-256: 937675fd5a621cad027a845620f3b7a1efc7528cfaa488ebc83a3f7e1c43ed76
font_01_sfnt_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5D 17396 bytes
SHA-256: aba7a3d014942734481d929a80417f37fb982f3072a94ce2e94ca487da346551

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