Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ebdd24a210042e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 08:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 792deab695e25a5d8f8667d95f11ea89 SHA-1: 1f0e15ff91fe2cd4b5d3a4f104cb7d32185bef4d SHA-256: 13ebdd24a210042ed3d155e6d9d61684e9cb4f30281401bea96c360d4cdeb982
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised WordPress sites and other disposable domains, a common tactic for phishing or distributing further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=list+of+diseases+caused+by+virus+pdf PDF link annotation
    • http://talleresjpg.es/img/file/43030166487.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/gawikalomukoj.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/sovipobaxabuwab.pdfIn PDF document text
    • http://mytaylormadefamilyusa.com/clients/864113/File/zuwelow.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/44421742877.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf09639d048---mefewekuvuliluwajoxaluw.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b953253dd---27556506869.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072d40c8e4cf---ririnitebipemokefis.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e7ea7a7572432e39890d590c4ecad1bb/67409385074.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/72025896381.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/3287034981.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/20055327382.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/4072009975.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/jf8ujf17nmuis5p7vd572n9r55/88138406057.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/30858755086.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c986798162---71072193162.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/71195031892.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5ppeubqcvo5b77rbo5f36o0bv1/31652287556.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4decdca6b---31289632852.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e16213318---22213742373.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/65310859610.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6599624ce3ce06fe1ec4fb7b75c9a7f3/95827661988.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/18487024045.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/f3k18h66fek23j0lrprjd2pt2d/84438214500.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/69741809542.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_off0000c231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC231 10840 bytes
SHA-256: dd625fe0d6ff0c29655feebe4dde635e53fb8818085a0b3dddf75204ba538bab
font_01_sfnt_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 19196 bytes
SHA-256: e845795f76b7cf048fb885bd7759cf2cc06e9518a30c81cddad77fce9d3eb724
font_02_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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