Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd774abffe4fe39…

MALICIOUS

PDF

94.3 KB Created: 2021-08-18 13:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dc210bccac6465ada35051c2d6095357 SHA-1: e99b418d85c22c9867a2a88a7255515334115eb4 SHA-256: cdd774abffe4fe396adbfb585e80ac79eea4283ae0df01c4032066e2c9b5301a
164 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable. The presence of a 'download button' heuristic suggests a lure to download further content. The document's structure and the nature of the embedded URLs indicate an attempt to trick users into downloading malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://aaaexpressheating.com/userfiles/file/32278512184.pdf In PDF document text
    • http://visit-pune.com/userfiles/file/15249105856.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1628182950zuwagamaba.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a747b157c---rafujilazidexubolinu.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/91450144439.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/9069522273.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/bamarisixozelotafutufid.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16083ed8713d11---lewan.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/kosadezob.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210608202033.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/98fb04183f16df17b3c5f9107db7a10f/5667493881.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08a5fda2b8---91159000387.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/36443b0ff5388a75081e11fcdc53f2c5/16410788292.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/92b1a141940bd2492f4c157c2209480e/lilavezalexo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3dc391288---baluxovim.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/97366239461.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/befugusevuba.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/rumixujija.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/tgd5tr1887b4l0vrg9th9auhe0/penetamibijubolupilipog.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e18665d9c---711891018.pdfIn PDF document text
    • http://ndt-ultratech.com/files/24058880818.pdfIn PDF document text
    • http://unsersohn.ch/images/file/vafolibijezukawawonuzat.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7209379db5273b45e19b74b7ddd637b3/denudovupegexa.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/gapir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dbt+mindfulness+handout+5PDF 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_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 17116 bytes
SHA-256: 492d64b8a888c2993393821c6c034218a77a5c65a0b40076e873d3a450a89f0d
font_01_sfnt_off00013790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA7 10896 bytes
SHA-256: 984f8b9fe52d28a6b6347b7e135ea2f2d4f22bc20b697ac497852dd1e91a43d8

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