Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9944048b0b4eed4…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 01:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41b64dfa1a1f72e93a45b5c31268ead9 SHA-1: bc0e4677fd213299c8ed7fe6d4e8d536a9076397 SHA-256: f9944048b0b4eed48be60199ac649922f346df556d133777efd51d429883771f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and does not provide direct clues to the user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://actor-conseil.com/files/file/50960258981.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a69f5c14f---57586273149.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/r9rj8ns769v9hbull23rjm9fol/84213787842.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/45803529186.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1afjb1igcvljpuigkh7h3i23i3/10665391123.pdfIn PDF document text
    • https://mahae.hu/files/files/pamiva.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/tghpb3pmdcfq1u53pq1pdm63jv/39982610737.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/kumogemasobatatipez.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbc11d1e7---xalirudeb.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2a3465a4b733c2b1d7e1667713f66c4b/vinaka.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210821_1DC0F21DD7460490.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e9bda1ed4.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2c9736ffe---lufuwipuwakulafe.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2f0d65423806ece2b40c83368b6455be/gimozinaxomaxiver.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/giwugagadutoxo.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/952232841b9c54279d3b06c0418842ce/25890878888.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/vagotiralomenelozafogamet.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/lusetuwelevunelimisiku.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/40651339956.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/wegesejoluwiponope.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/33182097471.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/76184634771.pdfIn PDF document text
    • http://soles2walk.cz/data/file/sinivamuxote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=kitab+asbabun+nuzul+quran+pdfPDF 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_off0000c611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC611 22076 bytes
SHA-256: f5d0c9e4694d05efcb0efd9f41d491f5dfb0645a45e93a60826b8edb509992a9
font_01_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 10676 bytes
SHA-256: 8d11cce2bbffa772757445c672e6bf49aeaf3cf7a48740de0dcba939a8991973
font_02_sfnt_off000117eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1