Malicious PDF — malware analysis report

Static analysis result for SHA-256 e556fe1898932445…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 09:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d930883897c08b36e4a31d44b7a2147 SHA-1: 199e69c4afcac686fdd1f68cc93dbb2d801f5447 SHA-256: e556fe1898932445d6ae25a982494e66597248838cb7c18390749a03c6fbca6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. The primary attack pattern appears to be a link farm designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=how+to+tell+if+your+iphone+has+been+hacked PDF link annotation
    • http://jiehuist.com/userfiles/files/wovujorivepuxidexokebed.pdfIn PDF document text
    • http://jfe.hk/userfiles/fuxuku.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091003214797817.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210915205008.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/39633525234.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60550842734.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/36119172202.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/2bdda2d5522310097e997ad4f148a271/61682318600.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/27378306596.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/55877707281.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138322ca0ba1---basavifikinopuko.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/fazuxitufaninagirag.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/33287524946.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/gotakutav.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/11733648345.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/lajaketufirujo.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/razabasuwadenuvagenoje.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/fawadageka.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/87569962708.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/6193006911.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/zopemifivopele.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c953e16e19---miwubikinilibojizuk.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_off0000b512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB512 15176 bytes
SHA-256: cc1e44b85d24c845d05538281874b2748216ce3605e095c8f2b688e879affc72
font_01_sfnt_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 11240 bytes
SHA-256: d393af143e013364aa2bf24cdccc3e7fee6456af3f7c601891e894fc419f9fee
font_02_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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