Malicious PDF — malware analysis report

Static analysis result for SHA-256 c336a07b077b9a27…

MALICIOUS

PDF

78.9 KB Created: 2021-09-22 19:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9acc44c1dc3a8e469a6373e450bcb72 SHA-1: 34a9b626e37b77dde5da8fd8f2b4222d04ba7201 SHA-256: c336a07b077b9a2760418b4b97caeb8031ed283ef7aa9bea5eb2cf4c3fe95d8c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which, combined with heuristics indicating a link farm on compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware delivery attempt. The JavaScript likely initiates a redirect to one of the numerous URLs found in the document, which are designed to host further malicious content or phishing pages. The ClamAV detection and ML classifier further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bselink.com/userfiles/file/bekebimozatarepimasij.pdf In PDF document text
    • https://kanat.com/upload/ckfinder/files/xulun.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1184d40a9---47831428997.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/fezokirenidoverunu.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/fodikun.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/jinerujizon.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/12377197872.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4dfd5183294be1022d9d73b2b178a03/11202520342.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/9998779257.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/pipoku.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161322fe5ee1db---98408532423.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/46035912165.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/kopafabelibuba.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/sedotisadarakizurobe.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/88395211830.pdfIn PDF document text
    • http://maxbrio.kr/files/files/fofopetirime.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/mumubudevaberafovudotix.pdfIn PDF document text
    • https://actor-conseil.com/files/file/91988254589.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/62dcer8svd0uu1lp5n3tr36gks/femusi.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/20883502866.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/zexedapup.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/62591810328.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/19739200671.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/29202498237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+escape+plan+the+extractorsPDF 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_off0000cfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB0 17900 bytes
SHA-256: 172f24cd838ffc2b399db4b7b793aba76b9a1534823da0247c1b74c3976c11d5
font_01_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 10444 bytes
SHA-256: 85c6de4767607d1bce0ca3d7e231458035721b6ddb81b23100b34f8e91fdd710

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