Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3744c4219b482f8…

MALICIOUS

PDF

77.3 KB Created: 2021-09-02 19:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98e9b8d9c49979ba1dc7177268a65b60 SHA-1: abceb6518877709bfe265b009fd27ee267a3eda5 SHA-256: b3744c4219b482f8a30c2473f7457ee7c34101a0adbd625282c04d02d2cf3dc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://irlanc.ru/uplcv?utm_term=que+es+el+liberalismo+politico+pdf PDF link annotation
    • https://motacademy.it/file/xotoko.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/becf76b7ded0e228aaef6979f0e86356/11472952737.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/fazukodiwafipoturegasa.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd22b22d5---96140768261.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lngbpdhf91k6ntp4koqu99ljf5/kusajanaposurux.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b48b4e14ddbb67a1aaeb315fb36a1388/71404295967.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/84272784746.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/35226730775.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/31565080327.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c1a50d37---xasomeladezepekomep.pdfIn PDF document text
    • http://centronegozi.com/public/jafezom.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/a742204bf19bcdae730d77ad3e2b7934/tovemo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f4fb8918588e3b39744641b128b91592/julapavuvududig.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/73417430378.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/183571048.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/1536d4522940a4f563c356fa5900a120/mawuseto.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a8ed44a95---goredijotafuwozukinofo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c966111e53---zufupifarikugoz.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/37493165661.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/vixuxafukewagenu.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/jobine.pdfIn PDF document text
    • http://renknh.com/ckupload/files/fidonezofupixi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d39c64f4---revijukepe.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_off0000c6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EF 10976 bytes
SHA-256: 27c695f81c90b2be91378df70f08190da9a73a8278c8056f11d38c17e9b6e52e
font_01_sfnt_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 18672 bytes
SHA-256: 48f00c8b5a525fdca1723852f438580d7f36baf95393719e6099f5dc877e8be0
font_02_sfnt_off00010fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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