Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae027da43f8ab5d9…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 03:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 598c23621537b30d98c01a91960fd70e SHA-1: 2fbd790be73425a25d52fc2da1476026271c5a8b SHA-256: ae027da43f8ab5d98d9c1abef9b6f935725080c050b88ac84d3ae5f777bb2d4a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social-engineering lure to trick users into installing browser extensions or updates. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://insidethedigitaltrend.biz/userfiles/file/litukimazisupujopivezoxoz.pdf In PDF document text
    • http://www.peretprod.ro/content-images/file/76355897933.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/22581706214.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161287ee10b322---52382993899.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/203ab3b10bb75b18307372a304d16d59/dumediki.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/78566431011.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/xapikuwiz.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/funixawemud.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f4f456e0a124cfab6df73f0548d0add1/gufizunirimupeminosovek.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4994b6f10---60948928760.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/693176d0121d99adba9cd1cc059ec9f9/46671456046.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/zoregisasituxagolifiziv.pdfIn PDF document text
    • http://aweibel.com/Photo/file/faxarazifew.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a13fbbec019---21545214067.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/pizusixawug.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/33f6ed716cae0b1a1b9ab3fa343a9dac/57821411117.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/0cafea54b195535632d575ff68584c31/jigajezabogeliliku.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37de645529---5662315401.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/28763368779.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/123815239.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117466a2fd1c---83776741193.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/ronitevib.pdfIn PDF document text
    • https://angkagenap.com/contents//files/susurexuxumovonipus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bar+feeding+mechanism+in+capstan+and+turret+lathePDF 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_off0000c42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42A 15968 bytes
SHA-256: ceca93df3f111eb56495edf85a11b962a2403eb46c1319ef0bab15ea5c4015f8
font_01_sfnt_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 11100 bytes
SHA-256: 4aac2e7ef0e649fbdbe2d923ad6d1b0fdf403fc082fc88fad365534666c7d3ca
font_02_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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