Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0655b620b83d54…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 08:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bb2b9b2756e11238a9e4a1dd722f4afb SHA-1: 5fb0cb08b963ee0f549e26ddc8433dc06f3f0291 SHA-256: be0655b620b83d5447e99a50140e825b843149e0240773e874e23015630b5720
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://zagi.hr/files/15252934325.pdf In PDF document text
    • http://china-miyaco.com/img/file/202195124441.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/52557984996.pdfIn PDF document text
    • https://e-room.co/userfiles/file/tatibunevufitujuraz.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090819184082.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/zitedawebafunagumalagabi.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135c95241faa---81262567999.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/vakisumesedosutet.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614034e3ca069---kabulavejapopovogiwexexu.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/sumeravu.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/vamiruxanozirasiwazin.pdfIn PDF document text
    • http://ergakiland.ru/files/files/felobenumulaxaga.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109110150437520.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107f0a30c3---sutisubagujufujuzufesiva.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/37900785758.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/xagavawusapinu.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/12288577707.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/41856928878.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/61876117932.pdfIn PDF document text
    • https://csodamalom.hu/files/files/32385240370.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/62565141838.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/36270799601.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/rixomafanosib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nerve+pain+in+chest+and+armPDF 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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 16316 bytes
SHA-256: 63821fb7f85fa84c9804e589c04072d9e222746157749786948bc7d0c26b28bc
font_01_sfnt_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 10656 bytes
SHA-256: 6fdec0b13b8bf2a12d7a6f8c4d849b630fc4dd0180b3fdf748730729a5d28f59