Malicious PDF — malware analysis report

Static analysis result for SHA-256 6502e5f6890cd11a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 16:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 88a3feaf2c41e39e6f018ba7a6422a62 SHA-1: e15572c69c80d1599c2b1e5841f9f429818ff7c0 SHA-256: 6502e5f6890cd11a8534cba4bbd84ac94865053fb2f1a16d1023d6e5fa9247e6
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, including WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using such sites to host or link to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file, suggesting it is designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e0b0d7e47---22111850486.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd70f3766---63624272976.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/13589010586.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/jatuwafuworovifaw.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/vazubebiduzigubawegi.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0on5cg9obplgbhdjkh25ole3n6/raxowefimodigularafifa.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160904b5f5900e---nekepubopilinovajopogewip.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/0923afbe1d47899830176973d86c3fb3/bajuzuj.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/38177121685.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/39371961889.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/mofif.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/6337066853.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021082616143918.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/27060232595.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fe46eba3b---xunaneseriwuwuxavuxagej.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/51454633111.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608242b9d2b63---faxefafabewinu.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/19125464559.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d2c792edb9d34604f59e20cc6539a3ce/fegikotasigudamaligix.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/on0nrgptndl1f9p1ic06a9qig3/suwozexetuximofepok.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f31ff0addbc3ffd8381ce560bee20d3c/27637414658.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/82806854595.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928d2ec3dd2---18135019472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=shaders+minecraft+pc+downloadPDF 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_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 11044 bytes
SHA-256: 5e9e23a2996898d7d3ccbaa9b0fe020be6803e8d4deb2db6821f6f7e419e8bec
font_01_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 17264 bytes
SHA-256: c69ec5527f7e26cca6c601c54c2afc1114403fa93d65380826e2eeb83c61f23a
font_02_sfnt_off00011d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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