Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63d8e3800d34ef0…

MALICIOUS

PDF

88.4 KB Created: 2021-08-13 15:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a692978217ca5b75af535911916a1272 SHA-1: 7ec46b2dae86a8ddfa09fe3acac70add193fa463 SHA-256: a63d8e3800d34ef0522967acaafb670a4a1f6c11faabf481f4f3ff5d03e505ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to sites hosting malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://irlanc.ru/uplcv?utm_term=kiwi+benefits+in+early+pregnancy PDF link annotation
    • https://hantverkarenisandby.se/UserFiles/files/bonejasofub.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/gebovoruxemiwumorak.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c633d8fb519319151c17aaa3fd1ffd3b/47646365216.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/roduzej.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8371564ad2---xevapixugix.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080e6f1cfbdf---zategafivibasedegul.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/5301561598.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/21463865131.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/salozifedewadaf.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210621185734.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/sughi4sjhgi4eia50ebs20t8f6/kiron.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/6483973483.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf0fb5d7c---16552122064.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99f839bb5b---zavozozawugiforojek.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/kewel.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96e03a78ac---70275307184.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/56155837411.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/40505978431.pdfIn PDF document text
    • http://castel.lu/userfiles/files/78687650498.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c76da74518f---lubobu.pdfIn PDF document text
    • http://fairtradeportal.pl/userfiles/file/dopino.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/tajebesumakinisup.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dugugejenabox.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/sakonufanotekifovowo.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/68238613893.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/50702495933.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_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 10868 bytes
SHA-256: 3ecf87ea9f3eef9bf93846fce5bed4f95f7b4114950da852ee89cbdc5f4a8fee
font_02_sfnt_off000127b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B0 16816 bytes
SHA-256: aea91345cac814954ce7bcc67b7693b28b4d4cc950731377e101fce44be2ca11

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