Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d63a9d6caeb66f…

MALICIOUS

PDF

82.3 KB Created: 2021-07-07 10:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5cacfa2d6036a09ccb93baf58fb255f9 SHA-1: e27873ef8a23e0b9bfb7202f41fc2d8c023176a4 SHA-256: 58d63a9d6caeb66f22589526eec984974fe07d38d7f7001ad5006b8f9d7aa707
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised CMS upload storage and disposable hosting, characteristic of a link farm. These links likely serve to distribute further malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/b155cfa5a32a2c745430cb68e8af2886/46791768793.pdf In PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/82f14e916272cbca7a655cc09d4a7f74/tawenesed.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5278dd2d62---wesajageruxodozafiwowi.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/61288861397.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d234e6e31b93873bb9fb09cca7384b74/vetebipavisovozubiniwukib.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609d55ccc0326---xewud.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/92248382529.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/mimidebuk.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb881b2b8---11426451374.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6a150fed665441968d9934e0bf6da703/degiziguvizumotinesu.pdfIn PDF document text
    • https://plasy.com/uploads/file/basep.pdfIn PDF document text
    • http://goref.ru/files/file/bepelugimolaxex.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eefe5a2e6c---88562568831.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/78042790595.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1305648d5abf38d2c75b492aa4619843/87271652190.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/6jj54jnqvr1q0793a4apdfq2p4/ketin.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e73896cd3---50763770267.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6f7i0bsdcdshvg082go8om30qf/58961344944.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/jisanemujatexo.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/wadopejogawarexodufotexi.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0d9ce57411f8a562ceb78a687316131e/didow.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d1728a43---takinalakimibigotiran.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=request+a+non+filing+letter+from+irsPDF 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_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 10848 bytes
SHA-256: 09fde5930ec073fc6d9a1a0e644a1d63cd04fd162d91b84d71f2fadc4318a335
font_01_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 16704 bytes
SHA-256: 31518c122605990b12924018812962791946bec3fedb6c9ea9f80fbee1ae9ed9
font_02_sfnt_off0001240c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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