Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9bfb6ad115cc34…

MALICIOUS

PDF

72.9 KB Created: 2021-07-22 10:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3732cceebc3ac2bdec7bd2b8106261a4 SHA-1: d180805a53e6ff9a21be6987ef894580819fe67f SHA-256: fc9bfb6ad115cc3482e577ba363b3b858a9ac3cc1d20150957781baa706245a9
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The document body is heavily obfuscated and contains no readable text, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kusadasidentalclinic.com/img/userfiles/files/kowepiva.pdf In PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ad97d5546fb550039575b976ad1256d6/83732659224.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6dcb3aad---tabogusugapaj.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b2b2118e---66647704847.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f4155c590---mojimuxulawibonejevaruma.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/19354911410.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/33ec3ebe5d997529c9de91f306d12e04/keredafuvufifimu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d5e21323---lufirokibe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160af1520736fc---21673293977.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/050t551i8fht58gpmsgf4gruv0/solodaxegabig.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2dd7b2c8---bajoduridip.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/b3363ab5adb872038f853724baecc2a6/ponuk.pdfIn PDF document text
    • http://aweibel.com/Photo/file/68853347683.pdfIn PDF document text
    • https://t2sc.me/userfiles/35168119350.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e6adc70cd---musin.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/sojakotodopub.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/31208089055.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb1573e043---34208253961.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/emeaf9lf9d70nvjabite3qa5h1/zonenixote.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/sofenufafopixosuxotonev.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/kigalomek.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/vexurarojunik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=solutions+fundamentals+of+logic+design+7th+editionPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB20 11048 bytes
SHA-256: e6c5df2a1c4a08890ec1159e1d6fb1f35af13bd831beac918173a0c3ce1ab848
font_01_sfnt_off0000d475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 15768 bytes
SHA-256: c1e541d8dd3c0ae0928cbeba19a59b90da628e3c20b20ac39d08b1014576fa5a
font_02_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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