Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8695e3ca57994e…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 21:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb6fcd90132937f5dad1e4bd73162a4a SHA-1: 5c99bab1796be3edd01c3ba6c7deb3332ae2a305 SHA-256: 4d8695e3ca57994e5f3ad83ef554eb2540b308849decadd77dc97fcd5bb5fb68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The primary attack pattern involves luring users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=redmi+note+7+pro+roms PDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/09e30122458d7952b2c1f29b6a644093/zosekokutaxonolagog.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/fdf1b220ed393d69ccad22dc4540b8e1/lolazolozeru.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/40053689778.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/49865338548.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/godiviferaweremazumo.pdfIn PDF document text
    • http://zimmerei-possert.at/pizojumerisitazofib.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/13410791261.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16148cae5e886d---90693264891.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/dijenebalowivepimaxug.pdfIn PDF document text
    • https://slotpt2.com/contents/files/95788605515.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/zasufan.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/vajefatapusovipakibipig.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/20204119627.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/83018826696.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/dumaratijuxutuninofal.pdfIn PDF document text
    • http://dgkno.cn/upload/fapotizozikumilesamomi.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/43707481829.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/wilun.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/xurebileja.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/wuwojupadejudixenedef.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/nipumosufume.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/kabusejaxevimu.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/fasatakapojegibusatifag.pdfIn PDF document text
    • 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_off0000b650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB650 17984 bytes
SHA-256: 7c624fbf5f90015a3031a5c1dae69e1815195b12fadd8f05c0b743c825d6cc0f
font_01_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 10440 bytes
SHA-256: 203a0456ab2d6c262340a965a5d18c4d28b0e3375f6be6563a784662399d06fd
font_02_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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