Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fef5b18136a840a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 10:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24c206b2a52f48444a8455c74036a606 SHA-1: 5a251179ed7d3fc72188dd8bbcfe786848978375 SHA-256: 9fef5b18136a840ab05fb6e636df5928dcbcb251e678ea4751c71413823acfc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely for SEO manipulation or to host phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ourconn.com/userfiles/file/202109010208037347.pdf In PDF document text
    • http://cnfglgreat.netsociality.com/upload/files/20773092594.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/05021804235.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/omqekmc49ps9r9qlcjvk885051/86015531135.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/4780629004.pdfIn PDF document text
    • http://thepducphat.com/upload/files/74571443952.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wunubilomanezumi.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/fufanatozodopo.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/tefud.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/42727338636.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/jujedomuju.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/pisexixapawotinus.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/lazugamenemewakuxarow.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210901062119158.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/xonufodupodukeri.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3fc467615bafe6a24b6c9d7fabb7c820/jonesufelodosafone.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/59839138804.pdfIn PDF document text
    • http://vejwun.cz/images/regegijabe.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f67ba2a762---sosexo.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/dozireramabizefivaj.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bea787d873---84077083633.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/24530890952.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/52185219582.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/xipotaxusuveba.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/wasaduled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=apps+like+bluestacks+for+windows+7PDF 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_off0000b39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39A 11060 bytes
SHA-256: ac311c4983b835f6e5d93ac440c040c759c28cf9cdf7cc4836dbde1f36a1fc1b
font_01_sfnt_off0000cd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 15248 bytes
SHA-256: d7f7e998713db236d5acfd394c518f84b23da0bf53697b3037ffd21fa97c9c25
font_02_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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