Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd90ed270e344a9f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 04:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09719776deb3568e57d2f976525089dd SHA-1: 8c64063246cc25363b227204abb4b31fc7549c6f SHA-256: fd90ed270e344a9f9e15a25d2fe026d59c0eab6753fdfe9566f03dfb6bc77d4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=peugeot+2008+car+manual PDF link annotation
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16121eb5db8f02---zaxosunitelaxizopodire.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/69321520948.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/kexez.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a4877c8e9---liwesanodaxipabakutoligi.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/13/41170059648.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/9192937169.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/resib.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/zikikesurev.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bb032da54---jifumotamewe.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/jovepiwegibe.pdfIn PDF document text
    • http://ozari-ua.com/files/file/posikilubimufinelubinid.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/bizejefafinakuf.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f753fec41a5a5c7882b46feb6eed4b33/74215169779.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/97482603235.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/kobaloru.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/pijufifonos.pdfIn PDF document text
    • https://amgaa.org/temp//files/namasevopop.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/7jn6hggs0hb4s286b30sbgap4k/xaxexowemineloripel.pdfIn PDF document text
    • http://waterreducer.cn/d/files/bufisadofiteromepawo.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f33dcaf0b3c---xopibufovelutomevupijizis.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/64578664571.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/magali.pdfIn PDF document text
    • https://alutat.com/data/file/37577164676.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_off0000bf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8C 16884 bytes
SHA-256: 26cb86b27bdf8f06bc728d60994129d4187f5ce841852ea476ae5b5143a3a92b
font_01_sfnt_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 10864 bytes
SHA-256: 3ec0567a0470f6368f7b70f5196b6143fddfd7043e4d8686dbf39aa9e82bb337

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