Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdf6de05773623a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 11:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df28d92ce8af3126007e4d39a1b4a7b6 SHA-1: f69c97512ae05e5ed1435c6b4d08a1fbed0d7049 SHA-256: dcdf6de05773623a7aeb36b0b83c0fd67ad948b9ff44e5c34d40c0e42dc06867
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://24cvety.ru/upload/files/bukepusozetotud.pdf In PDF document text
    • http://jiuxingchaoshi.com/uploads/file/101353206207.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b4e6ca3f---saximoxogijifisi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/02590eda0a42372630d7ab6ff5c81976/nakilalumogera.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/9082515815.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/polowepofelogenid.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/63781112372.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/bupufifuvekig.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/sivodabutodoso.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/87095378346.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/tigudalogem.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/49975704510.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k7806jf9cnqelcsaudj2dqglg6/57343181692.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/tosugevogevoxezifaxew.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/vunagexuzevalusanano.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/diralofu.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/jodusure.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f8e702429---39710544509.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7renm5kr3i6pmkfjuak9pi06tu/3550041736.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/naxupimitadiwuzujuvemafe.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/fepimok.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/82987912563.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/rijenanujipefijip.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/foxiwajaxinojokalilazeful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=convert+aac+file+to+mp4PDF 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_off0000d79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 17584 bytes
SHA-256: 995c6169b8556acce69a8d7af9a29efdf43483060d6d523c78d04d7be83220ff
font_01_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 10648 bytes
SHA-256: 84fad122d8acb17596afbadeefefcbd8d8d11c6bac8c07ea76d7bc8f801a564f

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