Malicious PDF — malware analysis report

Static analysis result for SHA-256 033641a22a9c0bf4…

MALICIOUS

PDF

84.2 KB Created: 2021-10-09 17:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eaabbc79c10eb2bddfc1a1999eeb54a6 SHA-1: 4861ed5ad0658322c55a6c15aadd78339782d422 SHA-256: 033641a22a9c0bf44b390f186f194507a70b22a0125135baade766bc0a2ea287
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external PDF files, a common tactic for hosting phishing pages or malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for these links. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving the distribution of malicious content via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.vegagastro.pl/upload/file/fejipikevaletosaf.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d5113c5618---wekesit.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/28654050736.pdfIn PDF document text
    • https://steammining.com/userfiles/file/batowonukiputujesekemigu.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/93720679736.pdfIn PDF document text
    • http://getem.eu/files/file/46105981978.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210902212721699128.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/metuvodoxemosifirazo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/83026747217.pdfIn PDF document text
    • http://napiarsaigh.com/images/mulexeba.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/87187955957.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/31394c0bf3ea946016f61cd9a6191d11/29003039262.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/wuvajarutomuwu.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/jewoledijadavosipasuzo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146eed16319e---fofabosupa.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/19443223519.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/43983389809.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614389631e4c4---juxanem.pdfIn PDF document text
    • http://sun-eko.eu/files/file/mexagafopojuwifojalelina.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/54665275696.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/79276913124.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/45513910831.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/67814420045.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/uou947bfblmsih8mosmiqp8uln/gofaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=you+take+me+somewhere+we+can+be+alonePDF 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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 10804 bytes
SHA-256: 3821660a97c03ca6c1194a0b2075633979f68f7adc8447a34d7e5b6bf3d52f23
font_02_sfnt_off00010c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 21080 bytes
SHA-256: 4556c7f17e8fd790604945f91aacf199a102ff8c034af5d8bee7152d013baf95

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