Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c0252be0038e38…

MALICIOUS

PDF

73.4 KB Created: 2021-09-05 06:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42cbf08b24f5069ec92e51a7bb74f5eb SHA-1: 6f404b5973efd35dda64ab3dfb05bedf898769e2 SHA-256: 48c0252be0038e38c43987668319d7111b096c001458cfd5eeeb1efa8332b9f3
176 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 a ML classifier and ClamAV. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The 'SE_CALLBACK_LURE' heuristic indicates a potential callback phishing or tech-support scam pattern, further reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec8cc1df91---11668613799.pdf In PDF document text
    • http://shriadinathbank.com/uploads/kokume.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ik8890kld6hdbdpnmm9fu9euh9/dotuko.pdfIn PDF document text
    • http://skupka23.ru/upload/m/47025816844.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021081613041641.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/3905753179.pdfIn PDF document text
    • https://medpressa.ru/files/file/30600842836.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cab6c31c927---38159398264.pdfIn PDF document text
    • https://avenue102.com/uploads/file/vapomo.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3b286a06ad0eb32416e28f9fbe82e32e/25569028275.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/gosat.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47621dafd---novasalipujaxizosu.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/rebeturokuvukutekaduv.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ada690b1723---69707587809.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/48dd4575ac2c400b7b37acc5489b9129/71877523945.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812b227c305---43237772150.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e5135a85eb730ee9f52c7d8b24fef1f3/gowumo.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/faxoribadijijovisoxip.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1485c7d21---53175633571.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/dabalibomalo.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/popojofujadarusab.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/bc1c6f1f97cf615b59f3977d5b47d337/weginajamagu.pdfIn PDF document text
    • http://airbaankhubon.com/userfiles/file/fipiripirewolenunukid.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/70569966230.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/doxopuvuvanofozon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=aetna+managed+medicare+provider+manualPDF 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_off0000bf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF08 15968 bytes
SHA-256: c665385451ece1cf1aaca07e9bb99e354e914988f27c717395a172104c821a84
font_01_sfnt_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 10836 bytes
SHA-256: edefc0f06e3c5b7b51a3e06cf1e8a8e07a6b13cdcabd29180ba54c630498d210

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