Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bb13d0aae28e4a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 05:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bdc40c73827d0558ebf803154405eb30 SHA-1: 9b15dd13fa878f7f261fa189aec1db6c0ede39c8 SHA-256: f4bb13d0aae28e4a1b15c8c10949b3ddfeea25ca51752fe03027816aa6bbe766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=comparison+shopping+math+worksheets PDF link annotation
    • https://motodubai.com/uploaded_images/files/beguvuwat.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/0fd5c860e8abeb7c0a0c8d9e6e602458/rovurowukaju.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b116f91e8f---beriputide.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/biroxeramivokek.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e9ae91171---57680498887.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/5265171433.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99e91f35e---fufakituxulusurijofup.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/49592113720.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/dafiw.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/gubefidikuvexi.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790d2f5f3e2---81820688294.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/17425246561.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/22699563368.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/gikifekem.pdfIn PDF document text
    • https://12shio4.com/contents/files/53177041245.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741ffbf1c8f---27062980062.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/gapadikifubok.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/76047817736.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bn9goi9hb8ll384hjj99r16pm0/40012623312.pdfIn PDF document text
    • https://wecareprogram.org/images/file/12061775964.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/60311d3e725ca0155ddf2d076e28cff3/jibek.pdfIn PDF document text
    • https://linardi.ru/files/file/38094686519.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/jaladabijaxavefavex.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/vumixowegikuxejatekega.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_off0000bffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFA 10860 bytes
SHA-256: b13ecc3a1657af37acd826ef48faa0fccfd798d1788a2ae96e23a84f8cdbee56
font_01_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 17448 bytes
SHA-256: 39f66eb0f9714d0ea0da6c27681a63f5bbda988c6e6ef5f3f75a987d73ee0aa7

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