Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6c626c9ff33895…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 19:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a6a2c84e024b329c3347f84a6566651a SHA-1: d11590ec97d317570d44ff7a7cc6f80e7c167f39 SHA-256: ea6c626c9ff33895ee014c3c08d4ab4723e10e5a676a38410b9bda7a8f82d986
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to link farms on disposable or compromised hosting. The document body is heavily obfuscated, but the presence of embedded JavaScript and numerous links suggests an attempt to redirect the user to malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://nomylo.ru/uplcv?utm_term=how+to+see+saved+wifi+password+in+mobile PDF link annotation
    • http://atrsara.ir/resource/files/keripunarudaxinonuxiviliz.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161300ebfe05b8---58141446047.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/pevafikemitafojefagoni.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/91427519402.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/pinenomarigido.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/33590089489.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/72503839869.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/nufukune.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e1766f14a2604eb8c54bb6bb31823d21/lupakukogudowawanam.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/buwulaxowizebapo.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/2197379962.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/91790633801.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/tisonupigal.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/87068784252.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/13805357572.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/jovuwarigaxugof.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/24371009108.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/afqf8ftoothdjic1b0ko8isd42/lodulogikapixujamefosin.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/zetuduxanuxuvosanola.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/66186744316.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a18e7ee2e1---11648308422.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/40894886438.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/87040091724.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613205af00b95---munumozupo.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/sirosajadabunujun.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/36252216711.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614197fc1aa5a---78388517426.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_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 10940 bytes
SHA-256: 3d5d31a3fea2f843408183f43724af55e6888aa91e38da97d5735a8c36f0a1e2
font_01_sfnt_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 18104 bytes
SHA-256: b3ad3921591a7ecbd4803cd98ade2d8887fd414cc59a4652d53ca1ef58806b98
font_02_sfnt_off000129b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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