Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9d8ab04f752d77…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 17:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1aeade7436c6a85d328901b96a7e94a SHA-1: ea343c5a8c147afbdbb5fd6d06afd0d3671e1422 SHA-256: 9e9d8ab04f752d7726bef7a2c6916b17fdf22abaa7680a551f5bc406c7ff53a7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites used for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to leverage SEO or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://bsa-billiard.by/images_from_html_editor/file/makixufoduk.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607192fa45181---14367506798.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/75305d351a8aa8c34582b6852226156e/11273508626.pdfIn PDF document text
    • http://allycatering.com/userfiles/43749272566.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/dejipetaxasagap.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/06/20210619170555.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ec893d21f---tamezosefikupiw.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/peravinabewezarug.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607998a8d8081---tipiweg.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aa404b1b0---ranujijimov.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/fixizekuxuzobixuzim.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/miwobebitutabavurute.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/tokarirasag.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ac5fc304d6dd81e2f6ee1b52d5388f78/sajukaxadolekovurof.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/83543987294.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/zugeropebesonugolamivo.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/23d44e8b5c8b8e8a75dd11d0fad00ca7/25062356783.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f8fdac1bd---96632017059.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/vejefotajurilodorusojajo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607851bc249be---22795560320.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/lujobezawib.pdfIn PDF document text
    • http://gensugroup.com/upload/files/zazumadikitisodozipasil.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210702134137693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=low+and+high+level+language+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_off0000c2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DB 16532 bytes
SHA-256: 87420ef3db7a6e36d08c97e1a406d6f96348caec3a729425164e49d71b24a298
font_01_sfnt_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 10620 bytes
SHA-256: 0747ebb5527855b2a4173249f18b3378f1970b04ebe3cc946b25b5847e9195ed

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