Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9e88a8296a241e…

MALICIOUS

PDF

88.6 KB Created: 2021-09-05 00:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6c9b68c3a3eb0c7ad5918c98dff88a2 SHA-1: abbbd8820521430e134a519aeb82b9e492466829 SHA-256: 8f9e88a8296a241ece281a3da1f2c639cef563a328bde3cdaa5090f484518d3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://xenang-mitsubishi.com/fckupload/file/wugere.pdf In PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/57985868290.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d48bc72ded66d0e9d55895d40e2c0882/24318292939.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/99969628481.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dbdb5b1e5---duwili.pdfIn PDF document text
    • http://dsagco.com/Upload/file/votopatijewarowo.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a5f5fb94ef67f8139c7250c2927ce9f9/89292528004.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/litasesipanizelapu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1a28c4b73---maxijupukazafogegafavude.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/niwoxawisibaleludajowot.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/zutijex.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/vezejuzulewiwev.pdfIn PDF document text
    • http://mosjob.ru/images/file/basapomoxojorasikufow.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/8bb33bfaeb79964129747428e36cff90/5816823737.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/vejajomapi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6a2c08ec---duwenamubivenojagepumexen.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/kurebafij.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080caaac2b4d---konaguni.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161133b2546ee8---niribadu.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/poxuvosegikunagese.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/689576ddaba8afd622edb755d6869428/kebov.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/lerogiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=distributions+in+statistics+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_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 17332 bytes
SHA-256: 24def6d92eed8743830773fd4ca3fad1c4d58d4ab537614ef5128d2949122abc
font_01_sfnt_off00012405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12405 10676 bytes
SHA-256: 4a5ef275be2666703c508c58ab1fe532f233550f356ec1731e63c4823b3d6c6c
font_02_sfnt_off00013c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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