Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9ae532a54660a3…

MALICIOUS

PDF

72.3 KB Created: 2021-09-21 04:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 218ac7a5f7ed21d7654452581f52e375 SHA-1: 06087cacf22288d604dff61eb3d051c0f5e1a50a SHA-256: 8b9ae532a54660a34eb521e24ea740de07be84623d10cf6aa8ff5f2ff9a335d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript and external links suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://medvor.ru/uplcv?utm_term=john+wick+english+subtitles PDF link annotation
    • http://lexus-custom.com/js/upload/files/widowibimadakajigu.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/pukapabosomisegades.pdfIn PDF document text
    • http://taxfreepoint.com/file/neridopapinaguzu.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/sazerelitof.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/jipizibimuwimenimowuz.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614449de7e8ed---44532406940.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/bipob.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/jivefitor.pdfIn PDF document text
    • https://andhimazhai.com/images/files/lipisifonumigofa.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/12841154856.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/jenegur.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/87484566589.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/18414804935.pdfIn PDF document text
    • https://il-gusto.com/images/file/rexelukawedixavesaxaxo.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/2425281999.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133dedf19744---wevuwexawidumujapexow.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/zexali.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16143aee70e319---zoximebedulisofatubo.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/tariberepewiwalaxiv.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/47392115240.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/konubunizisowarusobesupim.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/47b36db86f66ec7fd461de3a548238a9/98737210786.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae5171c20---jofisim.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/36255652489.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_off0000b54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54B 17912 bytes
SHA-256: 9d015954897c0bec5de3c9748b2644f4c71feb22526587f56357c7146288ce67
font_01_sfnt_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 10656 bytes
SHA-256: 5c2051e94563d3f55e84e522587414397d3f1994c03933a9e9173df3f6526ef0
font_02_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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