Malicious PDF — malware analysis report

Static analysis result for SHA-256 33620d59717af296…

MALICIOUS

PDF

87.6 KB Created: 2021-07-13 16:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b2b02ab0d6f1e0d9b6be72804f979111 SHA-1: cf4c71e2affd74f589ed1cd696d1d03ed758c19d SHA-256: 33620d59717af29669be62907f9c9d42ac78bb1215612a00487bba26b5286fca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and numerous URLs point towards a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=pubg+dj+song+download+mp3+free+download PDF link annotation
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/bb0e070907f6879cfe80c75a83b36f86/vufufaliwewusuvinetedomu.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/jaderorif.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b465fb0588b---sepidumalozewivub.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/zixewomepadafeguxewul.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/23f1509568010b95f1b0b460dcbb1726/26578104745.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c52fe958ba---33149285414.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072efa17f0fe---taporugisuri.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda42178ad---wajukolame.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff5d120b181401fbe91529bb0ea3a834/23264555656.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/87744172544.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2e2597719---51333519613.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/94679662820.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/32545505919.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/e1f7b40468f2a47f9120c35d38a1eaca/zirevodejubesubibaf.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/zikorudipufobujowedisedef.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcdb5dacea---semilizatefixifikunupije.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/85609670031.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c689d9b3522---42572516337.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb6a70d2eb---boxifimigetajap.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/65a3de9cee312d1a6188cbba3e34c1b0/fikiloboje.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/8458777357.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e60fa5ebe17---8752854708.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0d5d9eb69---nutazazezufapok.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f25cc10485---69099392051.pdfIn PDF document text
    • http://staropolski.net/Upload/file/dikobozodadojazeze.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_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 17492 bytes
SHA-256: 98a51b48c0fc25cbccb16d82f30d81a53307f2dca405fac153f3e65426a5d079
font_01_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 11280 bytes
SHA-256: c16e1b6a37cf5ff03910dee594f9378cc116ba25d00ca584ab99f33fba2d1efe
font_02_sfnt_off00013890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1