Malicious PDF — malware analysis report

Static analysis result for SHA-256 36aacfca13c2e051…

MALICIOUS

PDF

74.0 KB Created: 2021-08-27 22:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dce8cb4a4d8d2e93dfd12fdb089a326d SHA-1: c5411550e96e2618c2e9a57ba91234c679d93dd7 SHA-256: 36aacfca13c2e0518154f72000811605c4f588bca70ed33a92fd3fcc32a275f6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure malicious destinations. ClamAV and an ML classifier identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of numerous external URIs and compromised CMS uploads suggests an attempt to lure users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://humicdp.com/uploads/2021-07-17/images/files/vatuxefegi.pdf In PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64097312076.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/69fc05fefbd660288b451b9bc78acb08/79276554619.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fcc9b165---20202511135.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/87113651826.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ed9d0077a1708d4064106c22350e135e/pixiwepunidozugovu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5q2ov2qgjah3n8lpavpnqul3rd/demifef.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1451940bb8---befugovafosud.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/dekewexopagave.pdfIn PDF document text
    • http://bscartridge.com/pic/fatonubivamogetijiwote.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b304da91cf7---76914394809.pdfIn PDF document text
    • https://zhansq.cn/upload/file/ralirotekimazatasineki.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/24236153629.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/nedabazipupevosu.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/80805267859.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099f90f3bb21---sorofodudisarezusilolir.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/87614552861.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/tuzusoxadoxefulosiviviso.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8631028d42ae5f7ae4246191b759c6c1/62243151339.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607690fbe92b7---geworepeveje.pdfIn PDF document text
    • https://adikkedua.com/contents//files/juwipubejusatawipomelu.pdfIn PDF document text
    • http://usmleworkout.com/files/file/witufumepugadidogebexo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070045e33168---87015189104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=foundation+fighting+blindnessPDF 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_off0000c072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC072 10748 bytes
SHA-256: 520aa1101ececf72fc8dae98453bd64c08cc4c6d8acd80bb3c9fb7289c3fa6ce
font_01_sfnt_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 15988 bytes
SHA-256: 626e66337490b2a8e40c033c3e5794641ed055740722fe913c730a2fa9c3f663

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