Malicious PDF — malware analysis report

Static analysis result for SHA-256 5890ba97208d21b0…

MALICIOUS

PDF

104.1 KB Created: 2021-07-07 12:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4474d1c0a401e681eced53acf29e872c SHA-1: 6f6d2a0cdcce68a1e5a0567a0f6ed133b0c49a06 SHA-256: 5890ba97208d21b0d52e613374f1572413345cba15057d3a5c3ed724b1ddfebd
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 pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of the links. While no scripts were explicitly extracted, the nature of the links and the ML detection suggest it's likely a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://hz-karavany.cz/ckfinder/userfiles/files/8216722754.pdf In PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/vurufas.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/nanusejusowovusidazez.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/rugexu.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/narovidageguponopoxuxo.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/64628032353.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/95091852054.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/daxijujowivunezulume.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8890edf7---35295881005.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb691dda3d8---70683512823.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/bibojotajavilepasabola.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/da2004000122b5ac6445073f0a7a8505/zabawomefopomivaditosefof.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/bivosusogixako.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/susud.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609458338ecae---13097823419.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/70336405706.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/fanovokaxosefe.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/nsnlg4tujhvqa4u7nah02jkun3/1086843190.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/2588533733.pdfIn PDF document text
    • http://apvn.info/userfiles/file/putulaneju.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7259eb68e0.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baeae3207f---22831564782.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/keweromezolak.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4aeb84af---kovubilugalebabegaripi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=traumatic+lumbar+puncture+complicationsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13483 10736 bytes
SHA-256: c3dff12a79f76e918178f9e442ad1d65b86c0d178d04419adeb8ee27b25a0659
font_01_sfnt_off00014cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF5 17648 bytes
SHA-256: 8b648a00f5ef5da5338186f82120d9a32cd290c9cafd8c161923436be2271625
font_02_sfnt_off00017b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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