Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3637f564c81afe2…

MALICIOUS

PDF

190.8 KB Created: 2021-06-25 19:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b12158de284c77d59056fe688d494ba8 SHA-1: 49516d477331e53490fb894537c6aeda0c840e97 SHA-256: e3637f564c81afe2cb436b5077917bbbe9b429326441ee0332def309bb414c2d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://allytemp.ru/uplcv?utm_term=nuclear+reactor+decommissioning PDF link annotation
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ca36a3e27---vejowubogodunisex.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f2d0feb9---dikija.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/xetixezimotupubuxopikom.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/lepulese.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/vilujalekibipewigatulejo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d30c0bdc152f05e582a191f0e8cd4b38/nikijowefid.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0enlr0uao86vu14fbaav1kk51j/73004657868.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45d1c3d359b1489cd5007ef7e15e4065/18279499527.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c213b9c0f08---722879356.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1b7f50af2---90849161043.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160949f7e0df03---88723298616.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad82a60a424---81511984588.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/89c68cf6c280307f0297021b4e5788c2/mijigigijupesasok.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/4n7t2j64nbkk4p0h8lqnr5a7h2/16743974694.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/xuxubezevibozigebetivu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adf5beaa066---34131792819.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c772b9ea---2883569225.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9736978ab---54187837012.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/34233517753.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a46059bdcfe---27652181769.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/47bb55942ead0b0467e0b7ab7ea81c63/patekowevajosukitodeba.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/45336184860.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afb79ad9c03---53168875925.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/2rrphp9p83hk0jankc7oajjsec/73017403949.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_off00028e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28E48 10788 bytes
SHA-256: 88cc136e0b9c97e34113af565fe9a9b56d404a3f0b069ead3f73e2a4d344e2c2
font_01_sfnt_off0002a6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A6E6 17728 bytes
SHA-256: 614b9625a1663177c10f88998a0b4f577e05135fa2eebda5f594f0194f08d8d7
font_02_sfnt_off0002d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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