Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d2274af20f004a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 15:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e3ae71122624c6e44bbc1adf2a453c9 SHA-1: bbb4bd1b66c8afb25f324755656c1ca98bedb91f SHA-256: 91d2274af20f004a6619177c2cb64900e7a724e4f137623b016f9ff02f29dd60
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=happymod+minecraft+story+mode PDF link annotation
    • http://solo-reisen.com/media/images/file/64497527775.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161380a57f1bae---61084154124.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210908152531.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/fozozirukaxik.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/zizevezip.pdfIn PDF document text
    • http://surestegc.org/documentos/file/21040421273.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/9382299476.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/maxonagozewiwemis.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/jaribakerikopasaxizeziw.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/85738426173.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/65665941543.pdfIn PDF document text
    • http://nhabe.com.vn/ckfinder/userfiles/files/88652184848.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/mudusijiwunuzuxogamadup.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/rujotepazolopebijufuluxoj.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422e5aa74cd---49149910453.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ieilksrim7j5it30p6i9fon949/junoseziraxuwelazad.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/jezojepabagak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f70751df3---zefenarewuriposun.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/39048902041.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/febil.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109100758525731.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/torunomirot.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/livewatifomifexumiwev.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/1051896758.pdfIn PDF document text
    • http://www.heksan.com.pl/file/pivejibimasew.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/bavinigelowamujiguwo.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_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 16532 bytes
SHA-256: 939e1994245aef9ca331fed6a0d3f5b09b595f19a9ed3cdeb2615cb4d06bff49
font_02_sfnt_off00011b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 10840 bytes
SHA-256: 5b0674758cd23345c3e58d855989011a971c47c7391b9478aae6c4d8c0fe8122

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