Malicious PDF — malware analysis report

Static analysis result for SHA-256 1475ea4103ca4967…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 16:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c649809758ad19ebc72d1f97f6046493 SHA-1: b5c27011994c8692042ca4166a4e0e76fc7b2ae9 SHA-256: 1475ea4103ca49672fd0cb2dc81b24d8be218db029ac3a7abda2ea8f5018c47b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm or redirector to phishing or malware sites. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=tslprb+si+result+2018+pdf+download PDF link annotation
    • http://tpdw.pl/userfiles/file/febadegabelitusi.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9a85b3161---judefebo.pdfIn PDF document text
    • http://didula.com/img/file/tokabivegadap.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/41318791377.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/duliji.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/30408885104.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c5f6538de---72241945851.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/rowirurejetad.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef340991a5---91110868244.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8a5cbfee4---nomirek.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afd257a3fea---38405823288.pdfIn PDF document text
    • http://xn--80an2aej.xn--p1ai/up/file/sopafabafogato.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161043ffab2fa7---98912636254.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/78050331862.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/bexado.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/tusepetowoxiruzo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c900c82a791---gerovifipudedera.pdfIn PDF document text
    • http://ggled-smot.com/ckupload/files/xupesazodetadipidirurew.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/20ac02b666d6c2fa9034b8119ff1f4d6/sudewoxetekimulaj.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609413958ad30---10590616782.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f3e8603ae076ed402d930472bd4b9e95/pexabemotubivo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb722bb2e---pababatele.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2dtkd0iknrndotkfrpaufjbav2/sixib.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/zazitusojeguvijuzalig.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/48667233556.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_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 17840 bytes
SHA-256: d152034f7c077bc90c1764abaa1285f9fb428cc351723a584a40193146514ac3
font_01_sfnt_off000110eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12902 11284 bytes
SHA-256: c0ac44e0b323592c7c7ec4660e7e4946c1c003e843da12c30f6ef07e61e17752