Malicious PDF — malware analysis report

Static analysis result for SHA-256 d778aa2589ad1f66…

MALICIOUS

PDF

76.1 KB Created: 2021-05-24 22:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c50224b38eb8ffe913dec376794ca9d1 SHA-1: 350e1480d4f1249b2ac4c7d6c934574f24a49ace SHA-256: d778aa2589ad1f66bbc195adba34df8f3b6573d9955c9b70e24dab225f73639b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous PDF links on compromised CMS uploads and disposable hosting suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2a3a8b7703e72fb3d9223ae0fec54287/40855305289.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a624b587180---77178463119.pdf
    • http://ajivikafinance.com/userfiles/file/22999531077.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/99e73ef1f56a64bb86a549b65e6c00dc/67772479358.pdf
    • http://ufnk.fr/app/webroot/files/file/86604790713.pdf
    • https://armagedonspedycja.pl/files/file/bironixatazevim.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eedba2a18d---87221305624.pdf
    • https://cortopolis.ar/userfiles/file/zomeruzaxugukizomisetu.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091774938bf1---zizukuxikibaxiboxanixara.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6795ce3ec---tanokogagatetanotuj.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3a49d0c9cb221a7a3f95b95617dcae37/joxexakozowaperozukumeloz.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d768a55b8---34833820708.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089e2c70194a---47859116194.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082849ebabca---60228363819.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+change+alliance+in+star+trek+fleet+command
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e0.bin
33ae7a6713423c47a77813f39328495ffb8e13aaf3e23c9fac52bf44fc98e6a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 5552 bytes
font_01_sfnt_off0000e8a7.bin
a3f6af3de1ff3d6e9d3acdf36d54fd9076e38ee2138ce18711fa86ff5497d0e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 10804 bytes
font_02_sfnt_off00010dbb.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 16204 bytes

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