Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d0f23f32138b66…

MALICIOUS

PDF

81.7 KB Created: 2021-08-29 11:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a20f8e4233d5f087f2af401ba8e70e12 SHA-1: f6a03b2645775a2fd86579055bb52332523c5430 SHA-256: c7d0f23f32138b66a403f08fead51ae32d460bacaeb732e0baf39d351ea77cda
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://eltonltd.ru/sites/default/files/uploads/naradalal.pdf In PDF document text
    • http://mynigaoe.com/upload/file/20210626185854.pdfIn PDF document text
    • http://digifast.cz/userfiles/35882766689.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65b73753ce---65450600887.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e284e772baf---81860304339.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b38ae956967ef66b1de9cc7a7fe3bdbf/dofolusoj.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b89f0ed01---59238964051.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcbd8daef1---10299582018.pdfIn PDF document text
    • https://avflash.nl/upload/files/30037586977.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31ed3071c---vufulezugowoku.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608731bd6298d---gasotamuxilofelusudalig.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/fobipesukukapa.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/43414242352.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a258be9a---fexatonu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f90224ca02b---benewugivoririwunarenuzan.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/gudegavibin.pdfIn PDF document text
    • http://www.asslar.de/downloads/lamevulo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc594d8c3---nolagaxivuvaro.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd151394de---roxuzarivixijax.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/baxekisukolurojo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29043b0af5---6557301177.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/mafurogegivabobilov.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db6d183e78a---bizegafuba.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/momexirudewiruzegoboza.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/totekoton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=turning+a+3+season+porch+into+a+roomPDF 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_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 11012 bytes
SHA-256: eeb763c685196593cc2da72a46e6796a6bc6c600d47e93742e697568d5cc4f28
font_01_sfnt_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 17608 bytes
SHA-256: 61c54ad25000e281640651b195df546f1af42988cdacc7ce5460c1ca36eb4e4a
font_02_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.