Malicious PDF — malware analysis report

Static analysis result for SHA-256 0810f1b0b6df1be3…

MALICIOUS

PDF

74.8 KB Created: 2021-09-07 18:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d441a82b5cbe1c6a307a2ed5ea81b9ff SHA-1: bae0f77f4ed76015f7b2674e4275fb78e30fff2c SHA-256: 0810f1b0b6df1be3cf44d9f281d0f1b8cefb46247c4368beb21f4391c25cf1d9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains flagged as compromised or disposable. The ML classifier also indicated a high probability of maliciousness. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user consumption but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7669

Heuristics 4

  • 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
  • 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://bibliotekaludwin.pl/img/upload/files/nowopo.pdf In PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/46141615692.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/80814222039.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/29075270589.pdfIn PDF document text
    • https://drlanda.hu/user/file/gamugixavidedu.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16209658995244.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26115db9c9---dujenumenejojuditem.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/vofesabogidis.pdfIn PDF document text
    • http://pololanna.com/user_img/files/kuzuzuzowovukafixakuzibi.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/nikemilixazik.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/pewikuwosulunuxonakatex.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/56162405330.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/94451509128.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/96067974416.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16071e6239ddb2---rozilejonitixofakifuvev.pdfIn PDF document text
    • http://bdn10.cz/files/file/komazewofewizuguvujusud.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb498b57e5---48761571211.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135c2f6e9ddd---tofila.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/61590191861.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/vikuxipakubokivuresopixo.pdfIn PDF document text
    • http://capital96.com/userfiles/file/81920641707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=irregular+plural+of+nouns+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 18420 bytes
SHA-256: c1f0977103271cddf361046d3473a22af0e463597136f9679638876eb86b9bce
font_01_sfnt_off00011185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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