Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c600237d8a72f34…

MALICIOUS

PDF

86.8 KB Created: 2021-09-11 14:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7033cce3f75ea7ff438591f6f6891c2f SHA-1: 5224b769a842a7242d8319dd10a01a475b22f487 SHA-256: 5c600237d8a72f34fda99e016b46a4f0df56ef687365d53cb6593d7366478e3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and the ML classifier assigned a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage or disposable hosting, indicating a probable phishing or malware distribution scheme. No scripts were extracted, but the presence of multiple external URIs suggests the document's primary function is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://infrive.ru/uplcv?utm_term=how+to+call+email+on+facetime PDF link annotation
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27224772891.pdfIn PDF document text
    • https://masihpt1.com/contents/files/67938162590.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/71803100157.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/mapikusewoxasazipisi.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/dn17pv9fujfshkc2g6au30cslc/mozojopaderoxobofafobabe.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/padazoxunokabatezarefi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613670614fce4---971595567.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/furusiziwalebivajufe.pdfIn PDF document text
    • http://soc-in.com/data/media/files/45818459108.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/mujedivojijanip.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/kijafi.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/dinegukamovugebofejamive.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/17631730706.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613502b6cf525---doduv.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/24599293031.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210905_880A0A8FD2B55478.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/26621775459.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/besezalowamasiroroza.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/33433094136.pdfIn PDF document text
    • http://talesma.com/E/file/26675094173.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/86233349720.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/tugobofiferiwasasakivobaj.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/xudugipupa.pdfIn PDF document text
    • https://goodline.by/userfiles/file/rosakupafekewedanadixofa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD299 10308 bytes
SHA-256: 636128cbb2768ba8bf5113f928e50513f2307015520f8119f574a0c414db1873
font_01_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 18344 bytes
SHA-256: 30b80af5dddc20c9d00620ef2118ea180f3073066bab7c854f795b8cc5b9a590
font_03_sfnt_off00013174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13174 18096 bytes
SHA-256: f7926b4252e7015346fe6c73793d8b5f03414ae13ded748336e1006fb7a39200

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