Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb08f008f9d8238…

MALICIOUS

PDF

88.3 KB Created: 2021-09-05 23:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df75a1f4988d9430a14edac817ab9c81 SHA-1: 663eb369b1dd0e9c4bb2aaed72615a5b2d384dd5 SHA-256: 8bb08f008f9d8238714a3362eda8cce38ef177a151bf3f811790354c326d5269
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://circolodelpistone.ch/userfiles/file/50048477656.pdf In PDF document text
    • http://hc6999.com/userfiles/files/xigupemo.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/50420669454.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/48619916063.pdfIn PDF document text
    • https://ksboutlet.com/file/files/xivugavosovoropozosotofa.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/nvumqglg7cd4v3en6cmjulilt3/13530264971.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/11321369209.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/dilelapuzubax.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/81192598273.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/84965295656.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/339526ad5a8fe8b7c524b739020e28ef/1013732879.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/benujaseg.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/43894476674.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/71823539087.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/54471959275.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/gugezemolo.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/sevijajapulodazalo.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/rigoluzisuralefo.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/29407709784.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/59247582896.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/godaxiva.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ecf1baeb4b0b0be57a73b40e73347c2d/jipizoxixegezugifiripoxa.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac6a4d9ba---39682412843.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/goxororuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=comment+lutter+contre+l%27absent%C3%A9isme+au+travail+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_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 11308 bytes
SHA-256: a4030e7c1f2fb678f1d09902513f8f563e0632e90891f14b6aa940e86d7f866b
font_01_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 19960 bytes
SHA-256: a423f21125c46d557cc086509eca7856e3a08cc6e195f0bc4aa7761a94b9f9b4
font_02_sfnt_off0001388a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1