Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0746f7c569045e…

MALICIOUS

PDF

88.0 KB Created: 2021-07-03 06:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 410660ecb3f4002c30a8b5e0b8647cb1 SHA-1: 5b6715b8293cb23e1f306081a87339933f7cb6d3 SHA-256: df0746f7c569045e64289fb58b824aef74d635e17e50eaddec420be1601b00c1
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links on compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, aiming to deceive users into compromising their information or systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9badf6e3---61984838255.pdf
    • http://springbook.no/files/83354734561.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa41fd03f5---14531079849.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/avjlng36ctf6srglv2begnnnro/tobis.pdf
    • http://www.rify.us/cms-uploads/files/86662232425.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210619_42606692F5407BE1.pdf
    • http://email-database.info/userfiles/file/20174022444.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/b5ff8440fdaab13038ad45b92acd99dd/fasikugoguwibabaw.pdf
    • https://alakharia.com/public_html/userfiles/file/68808576187.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082e52356ddb---83315670887.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b90141b9984---47443942754.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f355c2caf---37367028666.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0c67ae999acc75ccd93efb8a6cdb8c97/gokaxu.pdf
    • http://tfforming.ru/d/files/zuzemip.pdf
    • http://i-daa-wl.de/userfiles/vukogejo.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160842f4e17383---6960769509.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/935f7f26bd1b818423d9f2f9f3e35439/veparujodasixuwomimenox.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6c3c9e7b9d8ce1ff376f9738aeb64bf5/zuxupanisosiwuletoxa.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/24846381460.pdf
    • https://aptitudeclass.com/ckfinder/userfiles/files/bidaratebidukanore.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094009c8a37c---pezuriworipiviwipalu.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7q2jrq4tfr984gq1jdnie95iua/nivugaterazitasel.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/tusurudu.pdf
    • http://tv-kitchen.ru/files/files/zebanuwesukabazofu.pdf
    • https://stratasphere.online/userfiles/file/bilamut.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/20400404999.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=geese+poem+mary+oliver
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f43a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 16792 bytes
font_01_sfnt_off00010c51.bin
4227147fd2bf1fcb6bf50878cda2d980799bdda9fc9795a2b5dd30da46093301
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 10432 bytes
font_02_sfnt_off00012402.bin
8595d9d08f29af7b8d00cac1d44ed40ad35e1459741076d7aca10e28070ee666
pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 17976 bytes