Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f17db287026801…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 09:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6c5b039a16ea80a11470535a191f510 SHA-1: e6daf171a7495a17e59c47ad8378e9746b5d253a SHA-256: e4f17db287026801af7190f34617da02d826854012c366746aaafdc9820cdade
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites and other domains. The document also employs urgency and callback lures, suggesting a phishing or scam attempt designed to trick users into clicking links or initiating contact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=funny+bingo+calling+numbers PDF link annotation
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e34a99f918---zesagozumipogugeji.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/joxenujukuvoxanibixuwe.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/dlpnsgmrm90lb3a8orbskq862h/joluxoje.pdfIn PDF document text
    • https://halkum.rs/files/10975931949.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/radenelifipesa.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/dofezofukovar.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/dobaminarajofuro.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/70eed6ac0620c6daab81d72422614e27/88959535044.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/namebiworotubexaje.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614014a5601f0---fefuvurujefibijanuwuxima.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/xegato.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2922b7302e3df1bb8f1d12c058c7ddd3/57473243737.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b1c0167970b89b5d19013a320e6fb332/95422811850.pdfIn PDF document text
    • https://icbacademy.com/upload/files/62021981352.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/mojapufunewuvoganop.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/ledilukovolowuva.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa7084bcd---83051439843.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/mupepulolelilot.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/febeperodu.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/ruludedararaza.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/76982611270.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/darovunoponez.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/27669634001.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_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 10804 bytes
SHA-256: 1f72e8dc14c4e1183000b8262ed03041ec64b9aca97866003fe7be0526fb8ce0
font_01_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 17984 bytes
SHA-256: b3ae71a088e57a39b93aa163a450730bd436ff75e3417c6af5d9b5fec5f23491

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