Malicious PDF — malware analysis report

Static analysis result for SHA-256 b117965ade63f4a5…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 07:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73d0da7ad4b24fde37936cbd716a9fa3 SHA-1: 9b450839972cdb671bc425f1743f9b3d36af58c6 SHA-256: b117965ade63f4a574df73544f85419208f071a73cc8172af22403d783a1b851
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the presence of multiple external URIs and link farm indicators strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de44db8e75---kivugivarupijuxukefugudu.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef7139082---keruk.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4bca02244---78331670767.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c734eedb87d---gujesuxerakobuxorujilafu.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9389ad045---zijokikigekusojixunago.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c4e350e0219718f5dc058120fd9f685e/6359675090.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160cff9b40d216---purun.pdf
    • https://jokerprod.net/userfiles/file/55247517987.pdf
    • https://aradovan.com/userfiles/file/1019550125.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/bogot.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bced881cffb---10724149203.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/7fb70482f232d3340bf2a2a242e89c38/duxiwidojefoxolovabopebu.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d339f8084413f8a502eec7f99c01a34f/jujolizu.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160828e5ee7ec5---ribosadarixigopa.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/subugedewivawilerolenul.pdf
    • http://rsst77.ru/upload/files/28186463407.pdf
    • https://ancoraeducacion.com/images/7571068121.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/444aac461f3781843df42440cfe142ff/figowi.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28c5ddf8e---wazisakuzudopisex.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a6146bb9cd9efdee6b5d24042704a6ff/ponijurolajugaf.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m6r5skq0865hk1k94lerfk77r1/2044029024.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160782ad9a550f---tasinipariga.pdf
    • http://capmar.eu/userfiles/file/30874562605.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+printable+lettering+practice+sheets
    • 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_off0000ecaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 16792 bytes
font_01_sfnt_off000104c1.bin
71deb87bdd033ac5d04f8a43a7ad7cdad2fdec669f18808142f0e3d758a551e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 17280 bytes
font_02_sfnt_off000131dc.bin
ecac37fee0291e5c0c1a9c9af38dfc5a6501226b3af92e5973039e4e4a3a2b46
pdf-font-stream PDF embedded font (sfnt) at offset 0x131DC 10652 bytes