Malicious PDF — malware analysis report

Static analysis result for SHA-256 253b005ef7613917…

MALICIOUS

PDF

86.5 KB Created: 2021-08-26 23:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b3a741dd624a8f0d2b669e10b2fd5f9 SHA-1: bfbf863011b9f8746bf269c25ab2e7890ad88188 SHA-256: 253b005ef7613917b3d7856cfde905054a05d7b938732d4db57df3b566a1b755
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://teranor.com/ckfinder/userfiles/files/wetote.pdf In PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/lisikulunafemalidabi.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/24503214477.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/69080424741.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/zifigatefumajo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff86412b6d---jotibujuwugaziku.pdfIn PDF document text
    • http://premium-h.info/files/files/99743224015.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/74197799302.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092eba11c4f8---zevelus.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609e00a70cffd---49916822653.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/63142855262.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba9e0e443---68465528710.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/14305172433.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753bcf16688---fafunizezomodavabo.pdfIn PDF document text
    • http://faradbox.pl/files/file/46526486222.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/gegepupedumatipav.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/bamapolasuzipopifi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3c1db92d7e093a2283ede0cfe4d2986d/jomisarab.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/kopavazajowimegozax.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/72137658108.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d2911e629a8528b29a4753179434fdf5/43757219831.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1r8jtco6836s26h5u0p7sa29q1/81593308529.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/73371401296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mythic+monsters+pathfinderPDF 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_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 16860 bytes
SHA-256: a11975bf2ad6b1e4240b6a6feff71c419a8ab2d267850b2ab319efd4e1f7c448
font_01_sfnt_off00011bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 10948 bytes
SHA-256: 4d4c741a6d239375ae025d7393d9e941f6d94f572ef2ee8a1d4c31b5c592ac82

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