Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3c4be63b2391a7…

MALICIOUS

PDF

79.1 KB Created: 2021-09-02 20:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06340a67ac11902036f242f2aefba2f4 SHA-1: c466ea04e942fa5bd53fddad709f71b592b78c92 SHA-256: 4d3c4be63b2391a71ddbab54e03252e23f146ed6d18a7ceced08a54790656458
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic indicates the document may also be designed to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://jimigubellifoundation.org/clients/f/f9/f96c94eea877db95ad0a8b6fd709b1ed/File/dugepekumepedudupok.pdf In PDF document text
    • http://soupworld.de/upload/file/81260085461.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/kafirevulitigataxate.pdfIn PDF document text
    • https://signika.pl/Upload/file/sasanuvukurumegipuzis.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8c05c82fec34bdc23f186f9891d1f1c1/woneva.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/76a7vadprri2f2qcq9e2l1ea55/26277576203.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607908ce7a9e1---3182950204.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2deb4ebba---17639181002.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ab4dd72ee7e5cbc37be4961f52687796/vemugigabe.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083423304715---riluxi.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/bijilefifeduvema.pdfIn PDF document text
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/1444946686.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3ee6d915e---sosiguwuwuniraxa.pdfIn PDF document text
    • https://belloverde.net/emailer/file/winuvirigeze.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hp0to8gui70urcqli8ou9j1c33/tuzodefaxozixogewozid.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/beninomipabadisudejo.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/54273090969.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9f7a1a5a67b80950bd4da5ef9f9a8f7b/kilusuwuke.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d1ea49fbf1c4c539ec106d9a01aa5a33/26971347486.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e781b4cfe---97787500568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ktu+syllabus+2019+pdfPDF link annotation
    • 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_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 18068 bytes
SHA-256: af6e6ee23035783aab7c612c562a2f7b8f4351aa78643f57880a02bfe36f137b
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C1 10748 bytes
SHA-256: 22127bd18966a69153c4695d00cbe516034cc33647e1562d45570e15fc996e2e

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