Malicious PDF — malware analysis report

Static analysis result for SHA-256 0254b3008e0ce2e2…

MALICIOUS

PDF

73.1 KB Created: 2021-09-12 19:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c7b64719a80f63fc503283b93df3a50 SHA-1: b79738ff9d20ddb42344c8eff4ae91886ae0cb1e SHA-256: 0254b3008e0ce2e214619be1f523589d2233b7d1ee11ab77c0fa76b6a71df2a7
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external links, many hosted on compromised WordPress sites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute malicious content via link farms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=android+watch+faces+free+download PDF link annotation
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613533bae5410---kevetatekapawoxurewaxaw.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f36053efd5---19852291594.pdfIn PDF document text
    • http://qdjshg.com/files/file/bibudinuwujak.pdfIn PDF document text
    • https://tsolisp.com/files/file/27379459924.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/874d157c51c8eb30b840ab76e972e66a/73169412389.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/18633874401.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/xirezo.pdfIn PDF document text
    • https://mcsfood.com/images/file/gowifonenejojaka.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/bazigewagavurixopazujazu.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/jufawudiwase.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/zujitimevi.pdfIn PDF document text
    • https://tsegypt.com/file/8321787177.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905142359182407.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ovu06crj4ojed7jtefnd3dknq1/wujapubejamifajapu.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/gezubokikimavadezama.pdfIn PDF document text
    • http://goodmax.ru/i/files/dorebatopupakezam.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/vemuxeniwikagur.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8ksi9nimoal2hpjjt3o9b96af5/2877210223.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/26090954823.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/52571335765.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/45806020886.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/waxixofejezide.pdfIn PDF document text
    • http://ukrfirework.com/images/file/20272270140.pdfIn PDF document text
    • https://sumangold.nIn macro / runtime command snippet
    • 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_off0000bb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 10640 bytes
SHA-256: ac676c34e9c847f6bc3ff51319c80fed8e37c1989fe9c9c2ac315502c4ad4f35
font_02_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 16708 bytes
SHA-256: ca3cc640b1af737e7db0343fba91d8fce8ec458c7c90054cbe2def4e5265ffdf

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