Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51e4a0029bc63f9…

MALICIOUS

PDF

96.6 KB Created: 2021-09-05 13:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b4fdafb340c475fee2ad0f91dc30593e SHA-1: b9133c672dbbbcc07a72b8060f4ed5ca437ce8f4 SHA-256: e51e4a0029bc63f976959aa4f9c1920af99c56896c5d71841b8e656730939782
156 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 to external websites, many of which appear to be part of link farms hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate the file's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://chcial.ru/uplcv?utm_term=marpol+annex+1+pdf+download PDF link annotation
    • http://www.museopizarra.com/ckfinder/userfiles/files/4831994437.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cec763a6f7---mifez.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609107b5beed8---latinigeb.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/19348886844.pdfIn PDF document text
    • https://hirurgija.me//files/sobisogokumakigilenasiner.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b39d3fd10fe72f699cb7939c02879bc7/tosanitawedibefewurupo.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210725022442.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9e4a6ed6318f61dc29572cb8647b44e2/movofigine.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edd8fca26b---siwedobuvolokekigitub.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/97025513821.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/pupulukufefebugixigiti.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f00893e590a---53761205667.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a9fd3f36---jujavejef.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a0a1d16c0---14999964507.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/42403281468.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/25784316310.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/va03k2geev2plik3h7039bh0l0/56678115079.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/27383648963.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e83322dea---90008520343.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8affe24ba---94784578718.pdfIn PDF document text
    • https://shopabrang.com/images/files/xowopasur.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/megalozopet.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/de73421b28d83b7084c13760857e64e2/30211905937.pdfIn PDF document text
    • 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_off00011645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11645 10364 bytes
SHA-256: bde3dbbb117840927555f1934d39012d13d6c1054157b7113adc01a30fe3b3eb
font_01_sfnt_off00012dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDE 18088 bytes
SHA-256: 098b1b0d72dfbf3a77abb045fc79dd2ab8dbe2103102c09ef1ceaecb632daf31
font_02_sfnt_off00015c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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