Malicious PDF — malware analysis report

Static analysis result for SHA-256 573b7427abaef18d…

MALICIOUS

PDF

124.8 KB Created: 2021-06-10 08:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 590877959ee4fa6fc6fc11981443b8c2 SHA-1: 69f422c8e3582bcda66239070d7d51711306ddf9 SHA-256: 573b7427abaef18d0a2666a236f8ce20b456e26087713290e86a724efd9c65ef
216 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including an ML classifier and ClamAV detection. The content and heuristics indicate it functions as an advance-fee scam lure, potentially directing users to malicious URLs. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external URIs points to a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://chcial.ru/uplcv?utm_term=12th+bio+botany+guide+tamil+medium+pdf+download
    • http://homenet-spb.ru/userfiles/file/20048983902.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/g43vbjtitcpr73k7d77e68qk6i/75620113915.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7c1bb119f47f73e977bc1fc3e0b93642/kureraz.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba79885b8c1---44590101564.pdf
    • http://banphimchuot.com/userfiles/file/85096434075.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d22ffe2ed9---wonifakuwaxadut.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607911e778527---wufizazirexovopodo.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9904741a6---96432564826.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/860b88cf2c46ac364e9400ae590717eb/32196514604.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad7a7664d4---87502401277.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc5a9a83c6---momurituvub.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5e8d01bc50bce1d559565bc0eeed0f9f/91843591386.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2b255a3824f28e5e38bea002a9c46e17/80244284952.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f73d11ccf5---15946635836.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608604e45b155---maluval.pdf
    • http://arci-mp.fr/admin/File/fuzijogug.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d46408dab6c11a9dd3a3aa2d92d72da6/dafilubimusize.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a029bbed493---80072266844.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001807d.bin
089b7c35ca4be5daf74490c150a98297f71538b5019c0fd7cb57d3534ef2d063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1807D 5604 bytes
font_01_sfnt_off00019381.bin
3b2b45bfaacf0ec98048afb69e628239b5d3ec2f4afa346e71f60f113c5baa08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19381 21476 bytes
font_02_sfnt_off0001c0d9.bin
af121a411b41b6692ae66e537e651989a2a64cf4509fa528ee83d6836fb82756		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0D9 10644 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.