Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd2e9ed1590e5b2…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 06:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a5bcf82dbee807fbd5f56c720257152 SHA-1: 32171081d0fea1c0d50161a7b999208cfb1c82e0 SHA-256: ebd2e9ed1590e5b264803ff067cbb271d765d7a3ac09aecf845a769515b9ee62
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It employs a social engineering lure, instructing the user to install a browser extension or update, a common tactic for credential harvesting or malware delivery. The document also contains numerous links to external sites, some hosted on compromised CMS platforms, suggesting it may be part of a larger phishing or malware distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://adeptos.clevercloud.pt/images/items/files/19267802313.pdf In PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/18350820516.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/wuwuvanuzekufogitunu.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/36201060491.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/b56bc80c88ddc28ac4743087a69afc74/51398425948.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/61459bbba9ff6.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/sofefakebufe.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/mimeximosenaverafomu.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/12690757101.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/jefataraxer.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352994a07e8---boloponenapota.pdfIn PDF document text
    • http://195exim.com/datas/files/belebesorugesejilelo.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/donepikuvajibabazebi.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/67189944510.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/29851755389.pdfIn PDF document text
    • https://esvigo.com/upload/files/zeduxutefawabidu.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/vebusuvefibi.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/82295581308.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/36619073464.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/37384428368.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400a6330280---dirobuxizepukamafitubod.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/regavi.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/88657044891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=taking+screenshot+in+androidPDF 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_off0000e236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 19256 bytes
SHA-256: 2f629c82e6cde72036cdd850b4ff4b108b05cfbc1e329d5dc557f8bc2cd2b12f
font_02_sfnt_off00012c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2F 10660 bytes
SHA-256: 59c03185f8120d71179d8363511ee9c65e0ccd9409458d72c5a19d452cbb14a3

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