Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac04ce7a301ac96…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 05:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c900a7a66a25bade8c6d607787aa9f7b SHA-1: 7871e6a4c6c79c10fe14d990719644b7d5d52096 SHA-256: aac04ce7a301ac9663717e541e4793c6edf0c19a0db96ac52191084858f98137
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were extracted, the nature of the link farm suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://babyindex.nl/images/uploads/nikotawonopesuserupizador.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v8lt6a2r3qtku7cgm99lpkud11/subosuna.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/jelewonogose.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/62998766598.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf42648fe---wirivoziluv.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/toweborebexutesep.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/9028339154.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/29219839872.pdfIn PDF document text
    • https://nexusmediation.nl/files/7289335103.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/24875117605.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f88210a500---nerukiwajil.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///warubaneman.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/nejini.pdfIn PDF document text
    • http://saltyfeelings.com/userfiles/file/64456512993.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47589406816.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/wefipewejitulu.pdfIn PDF document text
    • http://kisito.com/userfiles/file/riporugunanu.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/22/file/20210622_174440_135.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/82011658094.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed9064e856---binozis.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/ef93935eaaaaa9604b061bb04ecd01ea/kinokuzogag.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/lereliboluzogejo.pdfIn PDF document text
    • https://network-italia.com/file/70254371664.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/79f7ddf5edb330dd4e8fccabd502dba9/wafos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=present+tenses+exercises+worksheetsPDF 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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 19580 bytes
SHA-256: 23d45824539d46daaaa1f1531d034b1a62969f930d63231a9dfff8dde2122082
font_01_sfnt_off00010ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 10400 bytes
SHA-256: fbb2b157dd29da09931e876592144624a9e72056ec79a9a1055b2091d7ba5981

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