Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedaa4e4db6cab06…

MALICIOUS

PDF

78.5 KB Created: 2021-08-14 19:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f3ffbba94755a2193f54ccf5254514f1 SHA-1: 2c9090f794d57fedfcd0bb2015852efa7bf11b69 SHA-256: cedaa4e4db6cab0698165dae3d4cb10cfb7cab9d536e9a2c930dcdb97e991425
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a campaign to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e2d66be6b510fa6e773f35ec6f3e5992/kenalu.pdf In PDF document text
    • https://sieuviet.net/webroot/img/files/86434642039.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce36f6dd83---xananobagotes.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/zozeliwogadojitubub.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/78686804617.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/84130906990.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2811822f95---xizovonapebevasejiveno.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/88668799820.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/liwobasoxisuwi.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/75555599195.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a973a69b049---92838838628.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96d94a878---78114354318.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/zomusujawopurimubeludule.pdfIn PDF document text
    • https://xistenze.com/files/files/50274017761.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b1a1de93827b8383db681ecfa19bf29c/2282829554.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/vepodozupulato.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/cchniglrkl3lt2lhufnsc4thrm/93127742589.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/64737666313.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/doxelaxogi.pdfIn PDF document text
    • http://stringladies.cz/userfiles/34106814308.pdfIn PDF document text
    • https://atiksigorta.com/files/79680939406.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/52478482419.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/f9a151ac1270ba54331c677b04a350ee/nasojomazexalar.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/69571235056.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/300831586894.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/21522457362.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b1338cefa---nivediditomotufeguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+theory+in+literature+reviewPDF 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_off0000d569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 10564 bytes
SHA-256: 75fefcedd336cfd24672d14988087eaa737d74eabdbfd59e6ace68ec0d1ce0ba
font_02_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 14256 bytes
SHA-256: 9db8cb728a11d76d34728080fefce8ebfa675fec9896925066bac68b74f9a1a5

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