Malicious PDF — malware analysis report

Static analysis result for SHA-256 428703dfb7a3d3f8…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 16:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea4c2d701f0927cbeb1c7d21362e3e8b SHA-1: 1d14ab608683404a78671d427dc24bad74ea3781 SHA-256: 428703dfb7a3d3f8b12cca51c71fca33dcd391ea320313290fd3cffc5fcfcdd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate a potential for redirecting users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://herium.net/FileData/ckfinder/files/20210906_D22F38051F967455.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/de3e34c9509f96a71f6a1e319a8a5ca2/tarone.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/lowosapomevufufavuvabikav.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/wekaguzumogetuzaxas.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/tovefikonixopalozikinuw.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/37589596130.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/pixevebaxo.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/redurawukisifij.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/worilugilemozubip.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/zagin.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/bagupadezegazogusiv.pdfIn PDF document text
    • https://aashianarealty.com/file/85715445882.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/faxitamado.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/8435049810.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/zuzaxitanudakekuvujepe.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/zujaxusuva.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6ad96acc4d1562f2132b6b9de1c75579/suxakazamupipiletutuzer.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/8063061873.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/mewurotajuma.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///tufuxasutogedakatik.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/dominadobavopozotasemutub.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf3f4aebb---53867567902.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/32573012891.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/vuzagijorawetipije.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/patede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+block+emails+on+my+android+phonePDF 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_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 11200 bytes
SHA-256: 6f603fa59e721573abdf1ff9f1bbeea5ac61db2cca8ee3df53e4d2588d431f76
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 17620 bytes
SHA-256: 353fb913b668a33865b7e8531c566715e66d7a11f9b09400ccc7ee1422c048f8
font_02_sfnt_off0001327e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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