Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b44c23b98902036…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 20:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: afb282143686e227943907668d78e73c SHA-1: 2d09db6758260e8008f06b341dafbdfee541e5bd SHA-256: 8b44c23b98902036d3707a6301f65e324eb0c1aaecaa4b44b7b36eac244dd8d6
184 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious files or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=root+checker+basic+apk+download PDF link annotation
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/61817563434.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/jigubofawuzimifi.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/81124848738.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/vadetugepowadago.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130139d47c73---55628737877.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/dc7c858af47099442538875f2fb28dd5/pokamiwesafanom.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/gapojowesufuzutejuv.pdfIn PDF document text
    • http://tencanpowder.com/d/files/powivonoxopetobejonu.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/mujosi.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/fexoxagev.pdfIn PDF document text
    • http://lagrupacio.cat/file/28006299222.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/pajifenaterubisifud.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fbqlutc5crtf2vmbrr9aah1i9b/kupilobifivegu.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/zagabupikuwil.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/supoxibimerigokine.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/xodajubuvumebanepefimodi.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/mafoxofitufu.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/82552219528.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161401bf879c0b---98778613048.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/94287374014.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/13602095679.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/4063619260.pdfIn PDF document text
    • https://oasis-travel.ro/files/96946962514.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/wozifatafudopapuma.pdfIn PDF document text
    • https://topupdana.com/contents/files/42587983644.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/56047804282.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_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 10972 bytes
SHA-256: 95bbb9855bc7e01ab87360495a4e6d7b9f6a61019a1f554d429db470329cdc02
font_01_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 17640 bytes
SHA-256: 69e9171757ad52b21f2e5e1e186f6d496b247cccacb622c6f4c9a729b0dd68b3

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