Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ffc5d6f22e4103…

MALICIOUS

PDF

93.5 KB Created: 2021-07-05 23:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de145e67ca464d1b168220dc02bf11ce SHA-1: e662d2eccf857a290e932261f87a3ba6e56d3305 SHA-256: d3ffc5d6f22e41037a78eab9becc154f91a6654e2c91b8f97a4077d7a84f9efd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious content. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF-specific heuristics further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d68d764ffef37deb14acdf13a664e3c8/21971224663.pdf In PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4cedc3547f59b1e1ffaf845b656e9fcd/fotozudo.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f3529206995d2ca86b2a9c77b0df1f87/jebobuxosavojabezef.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3a7ca9597e81aa04ff1613df28310778/rigukev.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/28f86de802548e95fda2ad034a79381e/latigunad.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/57298825300.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c9ed89548af017445082bd93a630675d/68184128728.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e1qiq28jn6qfgubjnabvdac3t3/kinogeto.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624265359.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a49f1ecb9---ruxemon.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/e69fe1cc0a21e3ba41e0f8e6bee88a69/xobiduzovak.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3405a58e09---fumiwenuwaw.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/53e9fd94c19fb16b8d5ac63eebc926d0/37781955324.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/nisijazidaperozopofito.pdfIn PDF document text
    • http://tulga.ru/editor/files/22822862019.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/87359551143.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/84057e42faaaf0a1797d318103923968/86283753265.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ec29515bd---suzedugafupitenuzumaxaze.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3a3720f918df9d48f3c267520984a754/bobinuverixap.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/f8be9f5d5f9e13cd051b7282a931a3d4/51599814017.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/eaefd6d9c17c6da09a5cc1036d682c5b/wonumemaj.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ace32b69115---97398792336.pdfIn PDF document text
    • https://ancoraeducacion.com/images/71054175676.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/89835133526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=on+the+4th+day+god+createdPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 10560 bytes
SHA-256: a35250098bbf6573273547c45dd92049c020f67ba94d051f2c9eb237875f32b4
font_02_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 17152 bytes
SHA-256: f637974c18e07d36ba0008d921b0f6b57d80a87bdbec13be7dde187a50eb15f2
font_03_sfnt_off000150d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D3 16616 bytes
SHA-256: 0a01fd691603a4f5e31343b5dbdc350fb7c1481134d11219594ee5975fc63ffe

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