Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0a6de662e347b9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 04:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76b3d306cebe583ae79193e7d2591a6f SHA-1: 0f1d73974fabe50ae47053649339323aedaa4626 SHA-256: 2b0a6de662e347b94993f690162c2f12556eb1a1d055a358c67997d2e89e2590
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=moto+messages+app PDF link annotation
    • https://almentispharma.com/ckfinder/userfiles/files/tosadokukilof.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/13459671404.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/50952235482.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/82394979311.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6a3d6ad80---mavixawapukuzifaxowera.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/fomagopexajelolodura.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/77446098528.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/5948402388.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/24917689430.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/jonumepudelewafurug.pdfIn PDF document text
    • https://csodamalom.hu/files/files/mirevekexobezalugeka.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/37197526507.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161391af7b4d2f---jonolapitefisofapovoto.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/27197805826.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109020856169906.pdfIn PDF document text
    • https://ms01bet.net/contents/files/vumomebevapepokumivatukox.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/57706582867.pdfIn PDF document text
    • https://elemonbg.com/Files/File/xewarivabafizisivapu.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/89655952543.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/gerutoluwuwinowopofit.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1d63b47d2---dosegevononixo.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/o9o9jd9dma70sl71je38i0fjnv/zezamavudigefodabuki.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/bujejilipomedu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b0dc89484459dd31c70cc332a454dfdb/670123699.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-6/20210906231252603142.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_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 10244 bytes
SHA-256: 4a874b4602d86afe870bff01e850661e82b09a20fd920881c88ff1a9c3af9c74
font_01_sfnt_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 16112 bytes
SHA-256: 0d47af15b3ed1c52bee6cbcb023b7ead75d945138ede5577fa3e5520a7d19351
font_02_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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