Malicious PDF — malware analysis report

Static analysis result for SHA-256 606b7fe0708e07c3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 18:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9ed9b40ad76b27633d33198a117f36e1 SHA-1: 7f9da78b32b5407c91a021a4869d41137d6336bd SHA-256: 606b7fe0708e07c34f429f7e1d4381c68883072b7d9af6ce0ed129453ef74492
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress sites, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this PDF is part of a link farm designed to distribute further malicious content or phish for credentials. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/385c664d51a3a2d81a56c9791ec16296/godoranewasapamivezuforev.pdf In PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/vanezosibowuvenikike.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/54121895056.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e79a171fbd1784c10de50aadbc55b824/95140314630.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109ac5a6e3d3---fupevebatatefetufi.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/73774384411.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/falaxome.pdfIn PDF document text
    • http://foodchemsino.com/d/files/volux.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/zujan.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/50496529158.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/givajatujefesitomupogosan.pdfIn PDF document text
    • https://msvadba.ru/files/file/68314464965.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6fff4f40c4c0928512c35326bcc0496a/jusipirunu.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/61592317351.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/4596331503f29db38eb7f30e02b73a62/62047384862.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a530fa170aa---70070622065.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/tapivametap.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b750d66e88---xivorokipenanesosipigabi.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/d5d10311581a2d7e60131e4053693b7b/26929530655.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/xesonobumanoxagupenebol.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/db22b63d38c2f52b80470f74831f6be3/73950600377.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/51710283593.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/29754971598.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/tolinukitulizu.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/65131070027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=3+day+pay+or+quit+pdfPDF 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_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 17124 bytes
SHA-256: a9a5cae39921c58594ddd0d3d10d85c3fd22c363308632007b44164fe19aac04
font_02_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 10476 bytes
SHA-256: e673a92d52fdedfb2a48ea9d66cd1764f7f475e0e3b09d0ea3d6ea51c0b29b88