Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb65ba31c3551fa2…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 13:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 46de5ec29f93ecc996722b085df838cd SHA-1: 84776873878128b4fbd94faa76a1b5c7889c8537 SHA-256: eb65ba31c3551fa24e9ee9fcb717e04ba1d79bf99f8dc848b2aed2c73c06fb93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of many external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rajakeempat.com/contents//files/40673949215.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/t8gmk2pln0aeiustaq6chjkso6/88048057294.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/wefujanagexurarega.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/98208322045.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9befcc309---13365572938.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/ruzefolokejijevewuxi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/91d0086104163ce7184cd2eb8647d60b/96543540651.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/poxesubegopenu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac760a1eb48---gurelubaf.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/kaginomu.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1612531b85667c---39050689068.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/27e694bd8f5f3c0dc368606104ab7e92/buzesovagetudibamabux.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210818212202109.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/88516262377.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde2273ad8---15934986154.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/dagewiresatifulubefareruw.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/824f42f9d1daaf66e09c4ecee76eea83/furizozifisefogiz.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e99727a763---kukes.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612008e608078---47728658908.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/balogifizevifemil.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9df85c6f5b1317533fd6ac6531e7a33/lorijinaniwixodixu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd0ea24bca---49555010576.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/94953955148.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/38b2d8756e6b4a6ae7a17586a5002475/pexezusuku.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/55846200749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=decimals+on+number+line+worksheet+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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 18540 bytes
SHA-256: 27f4e5d03c323a1b9abbf7516cf34268d2716872d4c129f88cedb68ad01cb7a8
font_01_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 11304 bytes
SHA-256: e158c0f623b41519651e1c33c28d2f843f2bd6cac93612efbbadd331ef000d46
font_02_sfnt_off00012931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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