Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e587a2bbc23128d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 21:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f77cb36936d88c9b9b1296da45aa1d02 SHA-1: 93ba9bddb9e5b6bfbb21c51b254ef5fe7f603033 SHA-256: 8e587a2bbc23128d701f90ce35c0f64dee15c8af03033d6c7a912c274e3e7b03
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm and contains embedded JavaScript. The presence of multiple URLs pointing to potentially compromised CMS uploads and disposable hosting suggests an attempt to distribute malicious content or phish users. The embedded JavaScript likely serves to further the malicious payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hnfhdc.com/UpLoadFile/2021091813122890859.pdf In PDF document text
    • http://gfb.it/upload/fck/file/34867238485.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/dthrv3f6ibk91u5sc6knvjdftr/bizol.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/2339549551.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/92229105830.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/57709712668.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/89344506042.pdfIn macro / runtime command snippet
    • http://nickels.design/ckfinder/userfiles/files/86151994849.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/78319723650.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/ludidenudiwow.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/muxosegilujupim.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dipulemavutim.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/kovumibipesu.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/8441269320.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/05c42e2277d5c1a8892d4ecd13bf7c89/16608375096.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/94456884131.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/muludorewunipisijusowo.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/29658713594.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/voresewot.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153852ce11d7---lavijawokutupurifipe.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/werurur.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/woximutibejub.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/97148979984.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/zovuvofuborivotirubegobeg.pdfIn PDF document text
    • http://stagelight.pl/usIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=watch+american+horror+story+season+7+online+freePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC0 16304 bytes
SHA-256: 5f0cf8078930dfd0165b0efbb3cc8f70da1a8855ccd36ef8ea22f85fb4ba153f
font_01_sfnt_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 10760 bytes
SHA-256: 07a4f7e813199456dc48eb90f8ac033dc77507a4174d8ab88ef61a98a51452b0
font_02_sfnt_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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