Malicious PDF — malware analysis report

Static analysis result for SHA-256 9960385db5e6014b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 18:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a46c00f3d3e10b033d6376d7c158411 SHA-1: 263917c48213b458a1426706084e2c0c14aca422 SHA-256: 9960385db5e6014b0cdd4f78828b6947e00d33b1f7fd16e5fc818b56dcc554fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates redirection to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://tofuyatogo.com/uploads/files/69180456183.pdf In PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/zuliworetov.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/27392754980.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/36281984384.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/xuzufexupitem.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/10465222158.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/wukerumiwaxibuwuj.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/budelazexijajewogo.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021912544167756.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/xetobezuripuf.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/givifu.pdfIn PDF document text
    • https://rm-parketi.si/uploads/nexisovoperasowolorutogo.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630485312.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4ad11fcb3---32193361010.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ee66f1c27603f50dd17602ef2c6a3019/95988231244.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/bobigef.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/fegazaberoxeximedakag.pdfIn PDF document text
    • https://ubranni.com/uploader/files/48356920532.pdfIn PDF document text
    • http://dongphat.net/upload/files/siderufesobatogenit.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/45525766094.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/44567618473.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/ninako.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210912181307.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613348955f3c4---nabazeferunipejaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=biblia+pentru+androidPDF 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_off0000d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 10508 bytes
SHA-256: f2c25a441474211a6f21114b73f0df65d8efbd12e00fb7073055bbbb416f3c4b
font_02_sfnt_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 16892 bytes
SHA-256: e70258654ac18b4f42937f0e6f6ee2bca8aa8cf4fa13afacc28ab95ef91e51ea