Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ee9dc8aef9c211…

MALICIOUS

PDF

73.2 KB Created: 2021-09-14 00:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa3e5ab58cb3e642f05ed555eb14b1a5 SHA-1: 6890d540e9ce39eb5d52cbe8dd938b37d349f52f SHA-256: d9ee9dc8aef9c211173a228c4f1f01a936ca2456a636ba14a9a3f7a7ae684963
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://irlanc.ru/uplcv?utm_term=mortal+kombat+cheat+for+android PDF link annotation
    • https://lexcyberia.com/userfiles/files/vigevuxigujalosogis.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/mutudanifusalijukowi.pdfIn PDF document text
    • http://surtek.biz/image/files/20150317_135044.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf672e4d3---34533905037.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/popamalizemelifese.pdfIn PDF document text
    • http://wenxuezj.com/images/File/8125372712.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/pixokujowavitimekarapak.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/49136221609.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/wesonifizurixilasavujas.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/tezoferusoworaxofuvowame.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/78063889334.pdfIn PDF document text
    • http://blueyee.com/upload/file/070746546243.pdfIn PDF document text
    • http://becucci.it/userfiles/files/20795063976.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1d6be411f5ab60ed57b0b395a1bbd713/9438101782.pdfIn PDF document text
    • http://www.ezmoving.com/file/6684607700.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/10016478891.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30197143598.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210909103347.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613428ce14145---zagaxe.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090416100752.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/wofafej.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/foludogubinase.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/7776003141.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/rudukobotuwubitupu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c59054cc0---jutowajuzumeguwol.pdfIn PDF document text
    • http://usagimatur.com/files/others/55318124360.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/89229347540.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_off0000bce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 10800 bytes
SHA-256: 319dd4406720eaccfdde3dbd0a0d07e530ea06f7cf72d1940513fdd0f04619b5
font_02_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 15988 bytes
SHA-256: 17fd0f584c8a45c4419ecec6c8aaa37eb7e9fffc672de80db2c6a1005084e150

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