Malicious PDF — malware analysis report

Static analysis result for SHA-256 15715c4d94f6cd70…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 05:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4521232c4440a5a51485646d25d1633 SHA-1: 44abbd991756131b1791b8becfb5aa840b51828c SHA-256: 15715c4d94f6cd7094bf7c0ec90537ac8ce6d16d2b0fb7133e34e4a446f75123
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of urgency language further supports a phishing or social engineering attack vector. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 http://latiendasegura.com/contable_prueba/userfiles/file/20974897294.pdf In PDF document text
    • http://asid.rw/userfiles/file/3466521532.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gte9ckjpfisurrl15gb089dhft/kukikagudaxefupifuronotog.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/26884539999.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/pimemelagagu.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/gesonopabokopus.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d54129f9a8---lazuxupekilited.pdfIn PDF document text
    • http://w-mill.jp/images/file/pofiwakidegiveb.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/putemezajevoveg.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/71884097916.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395274cd5c6---31130571486.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/kenukulezegug.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/59956395402.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/zizekaleloturosifowukosa.pdfIn PDF document text
    • http://net-marketing.hu/images/files/vigemodafolilipupuvir.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/76505803747.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/39860276677.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/muwanifuwub.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/wakesutawufumozorarisa.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/30740236948.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/gadunajiganeto.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/99856188216.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kqof82p7n1uhje204nutkv74um/38649501104.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/29274612029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=2d+animation+app+for+androidPDF 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_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 19272 bytes
SHA-256: c5408b07b11e57b5a1ff0bf57f0ee73ce93af7528b32116493456f3a19f60979
font_01_sfnt_off00011951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 10336 bytes
SHA-256: ef4b099f3c09df505b0de373c06ab6196b97c82475a5ae3ba6c71a5a94c5d12b

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