Malicious PDF — malware analysis report

Static analysis result for SHA-256 e582aa891b24df35…

MALICIOUS

PDF

97.7 KB Created: 2021-08-19 20:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 060b0ee4b6da59dbe762f4f0c5814d2a SHA-1: 4be1402a074bbc22faa4929a26e27188fbfd56ba SHA-256: e582aa891b24df350665fb8de57673e63c7db0c2fbf3b21207268658daebab25
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of a visual download button lure reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://bjhtdszdh.com/v15/Upload/file/20217211034584154.pdf In PDF document text
    • http://coffee33.ru/archive/file/wumasifikatoku.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/83ec174f565f353403d0267aacf27752/44861569288.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be502965c24---63901370517.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/88418339028.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/dumogiteneduj.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8dc23c0e5---11908416560.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/xutamozezidusumaruzukikek.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/77207376767.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/kuletetatisokowanimesat.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/eh4brgkcr4vo3d79kvbdi9lhh9/pafim.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/36045062214.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/54880761177.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/2f7a10e80befb6fb4adc46a9aafc6b07/bepisetusedi.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/suzigovudaburawovi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ijomgs435hcbpnlq9uln327357/votozarexozamus.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ltle6jkvn8morgbqhupp0phb45/dimomowitiwawemef.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf86fc5b797---96875849701.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/67667353742.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/66348703835.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160811d08b7d68---2693360959.pdfIn PDF document text
    • http://kaies.net/upfiles/210801031038640963xdzd10.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/tatuvisesegaxisepofuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=amharic+keyboard+apk+free+downloadPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 19072 bytes
SHA-256: 42e724fb2f6bdd2838500b7d2cd295ecc92102e3ed4caa709a8fb63a659347b9
font_01_sfnt_off00012f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000144a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A9 11032 bytes
SHA-256: b108bcc89de259023b6ce40b24fe9a1e2c6e715646d7440aed0d5e5c68a6c06e
font_03_sfnt_off00015df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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