Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74071b86b000667…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 22:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 198d4cd6eb13d90b9633e160cfa572b9 SHA-1: c6e7e34e87454166718eae84f9ee6df645016bb0 SHA-256: e74071b86b0006675d5ab45e00108057ec9b56c7dc9f5348735706d4d082c303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of 'utm_term=fake+video+call+apk' in one URL suggests a lure for potentially malicious applications. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=fake+video+call+apk PDF link annotation
    • http://fohow77.ru/upload/file/lupekumisewuzanosalusitul.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/naloj.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/pimet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cde2113807---jukuwudovijuxakadekitob.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ben8s8bb3nse5obt2gpojj0920/rofibolik.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/nuwedovatazuged.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/9650501247.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/30253996000.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/37403463221.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/84898649855.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/sozoxoja.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/zorexik.pdfIn PDF document text
    • http://santabruna.cl/upload/file/30808847509.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/nanikabedusuxewupibop.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/femoposunufefaxomalo.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/rigaso.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/ragigupufarogegumoliw.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/lifofibubajafov.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/76810981268.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/wunavub.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/savasifafulekameruz.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161351a13eb85f---fikovetunuwagisekasasorin.pdfIn PDF document text
    • http://regmac.net/userfiles/files/32167308013.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/22403642927.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613741351ed73---30364520521.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_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 10172 bytes
SHA-256: 11e3d8543d7eb0b7a1e24810dbf57f68bd7082c52014c9479f908eb007d1f227
font_02_sfnt_off0001166d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 16928 bytes
SHA-256: 2219eec61f26636964409461633aec5ab929ae97184e0d6f7defed2806a39e9d

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