Malicious PDF — malware analysis report

Static analysis result for SHA-256 9088fde62bc84582…

MALICIOUS

PDF

81.1 KB Created: 2021-09-24 10:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e49607fcf11e113b9f004857e706b4d7 SHA-1: 35dd2e02e315b529df00e60b0d2c9720462133fb SHA-256: 9088fde62bc845828a80e63cfc81fd71498167fc32f4eb4d717270470e28ac1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were directly extracted, the nature of the URLs and the detection name imply a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c466a6a089ea0288dc3a66f582fdc528/tikunuzovisulakulejijem.pdf In PDF document text
    • http://studioschicchi.eu/userfiles/files/kupawaf.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/56946374439.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/nigejixojujexow.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/91574612099.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5e9fc9a2eff18dbb5152a414b639140e/sakojefubafofovix.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/pojodi.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/jotixik.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/jedivukarataloratuzifa.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/33700497234.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/94011404242.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/49229965345.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/27656394632.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/bodorewotosapamozuriso.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/vjf9bns7pvrb1v4ll6fr5drfn4/58611507175.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210924035335252.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/68117083656.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/64039328515.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/76335032459.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab59b66a4---sibosatisejazekizorofuvut.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/javonu.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/45188920992.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095919a4ef---gilusokarimuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+fix+lagging+android+phonePDF 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_off0000d7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 17972 bytes
SHA-256: 2c1ef0a92ea03dc02dcb1cde49c6ff4f9d43b19d2dbfb094f3b1be2b663fc8b5
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 10788 bytes
SHA-256: 61db7f83560fc90160c66cc7b01ff0cc2a9febfd4a9109a6a0d50a6f5815519f
font_02_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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