Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfbcc89c47694a43…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 20:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e4bf89c6c0d8848d1ddf3cac005508c SHA-1: 77eb5894f96ee89a587c0a38fc8d2bed06de4850 SHA-256: dfbcc89c47694a43aadffac3d677c3300112a6f39cf78a6772bbed77ccd66d3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of external URIs and link farms suggests the document is designed to redirect users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=best+house+ideas+in+minecraft PDF link annotation
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4bfae1da8---54995619879.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/tomumifedosiviwa.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/52824446433.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/16482916007.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/28858512064.pdfIn PDF document text
    • http://xn--12cf1djdb6cbcafdbu1f1cudgcc8am4wf7htgd9de.com/ckfinder/images/files/luwikit.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/79595825625.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jufinolofadotetixibovafol.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/nazaxomesomokukipa.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/72211278879.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0f8e03288---xafudipufajoj.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/jemirejipu.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/46592555613.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/171504518461335d43392d8.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/bitodinomelomiganesotonu.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091723214812.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/67820677635.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346967374e4---15146942632.pdfIn PDF document text
    • http://bptramptour.pl/files/file/49611890502.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5aq06c4c9onjc1174jo5tcpjj4/sovemadumelofigafivinaka.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_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 17276 bytes
SHA-256: d4c69be6affff1bc13a64422e82bbfe811bc28418ead3e1e951b5c5b6dabfeed
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 10848 bytes
SHA-256: 9b00dc77a00a3af95c324242cfa660419728113965633f10b8e4c6762dde2ecd
font_02_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1