Malicious PDF — malware analysis report

Static analysis result for SHA-256 27610128de3daac9…

MALICIOUS

PDF

90.4 KB Created: 2021-08-13 13:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 842eca5b460fc0b7b3cab9b28e6fa095 SHA-1: 17cd50a1eb43d51da3fe6a00fed9e41fb495dae9 SHA-256: 27610128de3daac9f68324aaf4f99f15c457d80903852e71c5b0482f1272b60d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. The primary purpose appears to be directing users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0737e9ba56---rajegafenukes.pdf In PDF document text
    • http://nhasachconggiao.com/luutru/files/29951036670.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106152300556861.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1032d096---6182910440.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/winalopexuxidufawige.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/pujurupoji.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/13679541687.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2ed30da4f30a0d2f739fb64e30a95916/xusubuzepasesojiredaf.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/37372892687.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/zitafadilegugufezuvibi.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/pokiwerabufe.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d381a2d64d5---72409782626.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b152e635f10---90494944989.pdfIn PDF document text
    • http://mousike.it/img_ins/files/dasezoz.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/wexuluvewos.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/womolezamomof.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/45552732753.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4f1651ff812d7a1ce7d1724faeff308a/dalulusuvalufiz.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/97576548611.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbbb1f918a0---2390974265.pdfIn PDF document text
    • https://ismart99.net/upload/files/98530147362.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9c931d76b---9037128856.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a6b4a595d---digafilerawiri.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/valufopogukenoniti.pdfIn PDF document text
    • http://premium-h.info/files/files/genapamalerirugiwub.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2e11ecc93769dba97ecc9a78c56df771/voravutodigikonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+write+a+handover+letter+of+company+propertyPDF 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_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 16680 bytes
SHA-256: 92fd90fe1b98254e3d88293a642df0e0d54e5350ed4c17b74a0cad2b4f7c8020
font_01_sfnt_off0001287d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14094 10976 bytes
SHA-256: 5cd9b3113963b353ccf202b3bab66b022192d9ea27af05d1ba934c7c0c0a88e7