Malicious PDF — malware analysis report

Static analysis result for SHA-256 94aa3664e4ba376d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-12 03:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d9c8cae823830fada44e94a769f92d4 SHA-1: ed84d4b6c6cd637e9178dda9c558de74ab65f057 SHA-256: 94aa3664e4ba376dc49b12e743bef089eaaf8e31e89b22a4ed5024612f7ff633
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a phishing lure and a link farm, with one URL specifically mentioning 'keep security apk'. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, but the presence of numerous external URIs and the 'SE_CALLBACK_LURE' heuristic point towards a phishing or scam attempt designed to trick users into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krisoc.ru/uplcv?utm_term=keep+security+apk PDF link annotation
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/rabovoso.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/7008508493.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/87066543750.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bef8e88afc---mesurujupipavotopu.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/nutukolizabamen.pdfIn PDF document text
    • https://campermagazine.tv/public/file/xutuwazaxosufitazam.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202191135156921.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134fe4a45bd5---64374725286.pdfIn PDF document text
    • http://carszana.com/image/upload/File/73583679301.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/48036533652.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/tezapetetawog.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/39445750020.pdfIn PDF document text
    • http://modero.vn/upload/files/90756238907.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109102021505032.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/8217032404.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169b7ebaab---dovabiwixo.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/16213527741.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/64354584033.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/947408301.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/87095378346.pdfIn PDF document text
    • http://micruts.org/userfiles/file/xibokejenasasoxiwem.pdfIn PDF document text
    • https://ikima.fr/uploads/file/65742094120.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/2755318191.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/wewedim.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_off0000c8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D0 18224 bytes
SHA-256: c229abbcbc41bc40adfa4406d86b932b727cfa65f1cb4021e4763310c084669e
font_01_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 10396 bytes
SHA-256: a290abe549895b8b3545efac52f092a84136935d792db3907b9bb1f531289392
font_02_sfnt_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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