Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd8fbfbd1774031…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 05:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d91b9c4937b46c62bce39935f4b243cc SHA-1: 7508382b42bc0e3dbfb7511581f045f0ec2fb8c5 SHA-256: dcd8fbfbd177403112c24759aae32b470f94edf31ca51cf0302a6e4408e7a6b6
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and other disposable hosting sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://laborke.ru/uplcv?utm_term=arquivo+word+para+pdf+gratis PDF link annotation
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/wabaxoxofafo.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/72457116501.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/2b9685db639036961596e0e169ca4f56/gafuwupuve.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/95336931504.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/xuzagobebi.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/sedosaforu.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/pawazurerebedotemefaxov.pdfIn PDF document text
    • https://assistenza-termica.it/file/rulizapixubexoru.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/55098224431.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/5hr5jecni85qikar61qok5b85n/lupej.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e03c5228f---95875311298.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/pelapumibebadovoxopej.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/zefegeguzos.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e1198d788b4---pujetukisuzukotuxasizug.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/noxelege.pdfIn PDF document text
    • http://18554080.com/userfiles/file/bupigeni.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/komurijadepejavazatizele.pdfIn PDF document text
    • http://builderall.info/userfiles/file/83602721619.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/jasobo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160772cdc73dd0---59611356868.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/30785747192.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/1bfb8d4134bb90fd17b2fdc4f66a2bc1/vemawemutodilanigu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff4f6ac5d---lunakijoremavumedun.pdfIn PDF document text
    • 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_off0000cf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 10768 bytes
SHA-256: c50f6551492547802aa9321cb20d3d9f344eaadd1e9843e3ddf31fbba1b8d3e8
font_02_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 17436 bytes
SHA-256: 440a43d0326f1be5ff55853433c2ae36743a725547fb1bb651b2d53f80814e1d

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