Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f86e7929bd989b…

MALICIOUS

PDF

70.7 KB Created: 2021-10-04 03:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 151acc088949bc3cfe6be428e63b06c4 SHA-1: 364d9922834e70fb7e9f1c5a6a49903aaba59d03 SHA-256: 51f86e7929bd989bcca1dd6fcc446547095842d55e6b9613aacc1628da3bedd4
164 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 as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=my+ding+a+ling+live PDF link annotation
    • https://maria-galland.ru/files/file/gakidujibelerif.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/77788229149.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/94301901308.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/xuxubok.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/rurut.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/buvarazilexigosox.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/taxub.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/05a77bb74d5e0595743b849c84e4076e/pejibekaduraguwiramararix.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/xojilitexawowuf.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/34705464149.pdfIn PDF document text
    • https://krishnacock.com/userfiles/file/62144238860.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/demosupa.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/xitojak.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/77731945223.pdfIn PDF document text
    • https://wita.lt/images/files/xijurudaruxufuj.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/gupigu.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/wukazuvanenidanugop.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210916122436740351gw87f2.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/64088016533.pdfIn PDF document text
    • https://termofriz.rs/files/37908888050.pdfIn PDF document text
    • https://avukat.kocgrafik.net/upload/files/loludivovup.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/70281535974.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613810b3cc782---71249464805.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/gobezubobediwegiwe.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/44840323736.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/209009405d4f602982e591e2b2f6975f/kezujoxoje.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_off0000b498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB498 16688 bytes
SHA-256: 59e22c3c0d8bc73acebb71e06fda7e945c225c5ca3e8ebcfbe5782473c4fb181
font_01_sfnt_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 10112 bytes
SHA-256: 9c98ed0e9249906881506e95a7cc37f49ad7c28c506fd426ce42fefda207eb75

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