Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9885cd659206595…

MALICIOUS

PDF

72.2 KB Created: 2021-09-29 07:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 340b4c80db32df2ee41fc5d97f7ea428 SHA-1: 34e7ac419506bbbd4bc6afc45800f0f1725e6e07 SHA-256: e9885cd659206595f668f54217039e0179459c81ecc68b5d297ffabb2ba8acfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=harrison%27s+principles+of+internal+medicine+ebook PDF link annotation
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946b03cd1f---gaxukikuzigoj.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/48617994002.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/87528666307.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f453a5f689---kamalu.pdfIn PDF document text
    • https://tomas-music.com/contents/files/wewuboja.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3b2a4fecda67b6fb7b23a9f9bf7db931/69368538100.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/95592917537.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/28578071846.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144b9c570935---judipozifiwupujepigipurop.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/sisag.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/rubedozadupozujenukam.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161504905bd9da---kimiwexidebuxok.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/lezuxix.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16153a4e9db0f5---nasadifetosuvinik.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/57647319122.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/49601856804.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/47438163285.pdfIn PDF document text
    • https://mihalex.by/files/files/vagagukijizuwexaw.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/34724742220.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/luvimedikuvoxuxafovil.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/1235269749.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/nopumalafukefatafifigiza.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vawivazaxab.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/75985762871.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/86947346089.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_off0000b544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB544 17132 bytes
SHA-256: f07e6486deea3df4388dbfd6df26059944faae8b235b5eb9325c88d2c9ac7bcd
font_01_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 11040 bytes
SHA-256: 9bd36ca8a2de85ca646516731f03ad6b19cfaac3e50cb134c4cd4dec6568f853
font_02_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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