Malicious PDF — malware analysis report

Static analysis result for SHA-256 3399c8ec7e214232…

MALICIOUS

PDF

72.2 KB Created: 2021-09-11 14:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfec357ebf4b5d0cf92032fd19d8d5a4 SHA-1: 3e8bd2d8b76da1dbcefd25794ee8a6854c765a62 SHA-256: 3399c8ec7e214232b7d9036908fc2380c2c84754cba378d037f3958068da34f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates potential for further exploitation or redirection beyond simple link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.benkorner.nl/admin/library/ckfinder/userfiles/files/84731208162.pdf In PDF document text
    • https://tauthuy.vn/upload/files/lurasapexotisag.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/80870446458.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161331d45c150f---mabaxivabajarid.pdfIn PDF document text
    • https://tl-systems.hu/files/files/lefumajuwomuwigotumatit.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/76300776110.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/wumemijudodosavame.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f63c63748---pokupexogikegozumimodinim.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/kibonevajobevore.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161305309323d5---vopuxeliduju.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/zumoxugaruzajazivuxat.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/bakelewog.pdfIn PDF document text
    • http://lyshiying.com/d/files/vuzirepirutejunik.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29216986f---jibowakomedemudajuj.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/zatanutajef.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b4123e4f---5554063288.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/11745888186.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/43372938a8f0a1ddece0903e5d051dff/63193641880.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/todakipaxovesazubar.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k95i4u0hvabopm64t0hqqlgrj0/paxeru.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/biwase.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/50991540655.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/gawozijexat.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/duropijanuwexapapazonep.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/50372152017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bus+simulator+hack+versionPDF 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_off0000ba68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA68 15684 bytes
SHA-256: 3634b037a7f744783035ec56697a35572a1f3fead679ed6888cac14234a35e4c
font_01_sfnt_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 10808 bytes
SHA-256: c87881497321629064b2b28642f1bcf30d9ca287c78c452376b03ff2e4e3ee6b
font_02_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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