Malicious PDF — malware analysis report

Static analysis result for SHA-256 6655d6d0d93b4d7b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 14:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0778589b3816b11922e077dbfecf7c3 SHA-1: d08a2e8d090d3c38f5f45f56ebdd8343f410c73d SHA-256: 6655d6d0d93b4d7bde0efd4d13f616df3f7d2dcc5e5e96adab0d50d5793297e2
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a coordinated effort to host malicious content across various sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/gemisuk.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c01ce573b2---gamogokegozepipux.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/berotuwemufir.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/repuduvefax.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/85194779195.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/77605117002.pdfIn PDF document text
    • https://call-life.com/ckfinder/userfiles/files/52044090069.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/af8d10b45df2ab9d7c67e760d806cbfa/widerikemalofuv.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/o2nip5bo5susaiv6jhdebbtil2/nuwixitopidijatupewe.pdfIn PDF document text
    • http://th-hl.com///upload/files/fakimawo.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/74301601532.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/rivazakapaziwerezukoka.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/15705735816.pdfIn PDF document text
    • http://mamitobe.ru/files/file/serujubamowoxejomar.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f36b15d91---50094445515.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/63690672189.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210721_211731.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/kumasazibimivebet.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v3dpkrnc0mad9vdlaunfrnt541/19748156007.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/pumidutotibavenuv.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/364sjrldc5skf35dfvdofas2gf/simotigaxoja.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/jamumiroza.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076083f1c6a0---wuvekakavikisovurer.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/zoxovufeguvorunixurubuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=technics+amplifier+manualPDF 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_off0000c3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C7 18392 bytes
SHA-256: 15a5bc1ea5fc8835ec0d65d2a790426290b3f52c77a0ebb117154480d21e47e7
font_01_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 10592 bytes
SHA-256: b50ff095d147a9dd9b49a908f4f952b80b571ff5c1ca4b845f73b503de16899c
font_02_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1