Malicious PDF — malware analysis report

Static analysis result for SHA-256 604e5a6d3008a0a5…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 18:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c5ecdd67bfabcac4bc043ec2da0bc430 SHA-1: cd2ed9ab9bbca7d2d2d06770b1c154f43b1e25ee SHA-256: 604e5a6d3008a0a5ccd161b7efce36e51fcfeba96a070fae45c9b19fb72c6f2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • 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://khojedu.net/userfiles/file/livewafefo.pdf In PDF document text
    • https://mycocoa.org/images/upload/files/82388441832.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/momesub.pdfIn PDF document text
    • https://aromamarketing.md/img/files/56218055869.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/67980172703.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/jemetoxase.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/xobilawunakudu.pdfIn PDF document text
    • http://ciskmv.com/css/file/67152889171.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452d181e48b---88752334658.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8f6abb0ce---vinilibomupev.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/40503808908.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/27883573418.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/80995717116.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/34889013477.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/75165593878.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/lugopoluvaruxipiroxazaf.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/kk0i7pd20d7ap5ckfu754ltva3/98010969393.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/nirowuzirowuwada.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/bunenela.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/17508695717.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/1908621789.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301072dcccb---88079060170.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/vetij.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/10b547bc4fadde929d985da56a12a552/40940205178.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/niramevevexona.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109160101045940.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/nirovoxavetibapidonema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=telegram+apk+2019PDF 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_off0000b2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D1 16100 bytes
SHA-256: 90408898162f78616ac0c5eff3272e3a72cce7d0ac980f39069ba5344429a604
font_01_sfnt_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 10528 bytes
SHA-256: f0cb693a52988d7882678e13ba08f1b2bda776959c09e3c40b3a2be7cb2b5cfb

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