Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3ab642e5fe81ed…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 12:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11b297f264885543ee01fa371a1d6347 SHA-1: 8c89b9d773e1a2be6de1c2d4a8b83bf6c0734982 SHA-256: 4d3ab642e5fe81ed49afe46c5710b595e2d5af8de33cba2cde28fdbc33234523
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic where users are prompted to open a password-protected archive, likely to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=how+to+set+icloud+email+on+android PDF link annotation
    • https://satuldelut.ro/ckfinder/userfiles/files/18372762992.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/2089647578613867007caaf.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b5974c006626673ab4e1509fed3d88f3/buretivomotujefil.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/momepogopow.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde1ac3a5d---nasobipotanerinob.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/28247257123.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/53540348708.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/61341554980.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/42284913232.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/65956474195.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d799367b0e---40129756208.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/jibaxakozel.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/13709282072.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407e6408712---fezepusonarufonumazadaz.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vawafuwemabexok.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/tisakad.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/86882207886.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/ridoralobum.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/58784270673.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/42b9e20064263092a93f6ede968156fa/tivenegufudowizazixaze.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/80158170609.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/39073152300.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/92635441222.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410d80d952b---75683865378.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/25674260574.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/dirozelabamomazobudon.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_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 10708 bytes
SHA-256: de0b412ff245d8b496dc5e30396f28b276cce5abbbd64602afe667c8a92c8951
font_01_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 18984 bytes
SHA-256: 82c31c3c3d828e4de679dbb62bd6b2fb4861ab11d78e11801527e2eeee946901
font_02_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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