Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c931f7e1bf02dc…

MALICIOUS

PDF

93.7 KB Created: 2021-10-05 10:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0554dc439ff18294264a7e900699261 SHA-1: 167044449c0512de035203c2caae9c7777bda831 SHA-256: 17c931f7e1bf02dccf6fed99f38c5dc3e9b27b225cf6055f29997cbd7e499065
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links to compromised websites suggests an attempt to trick the user into downloading a secondary payload. The document body, though heavily obfuscated, contains elements that, combined with the heuristics, point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=foxit+phantompdf+express+for+asus PDF link annotation
    • http://jyjjapan.jp/files/ckeditor/files/68990094305.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/10604819427.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/74447014622.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/0kksihmq64gkul307fuvsqpvf2/wisiruzegilanusoxexape.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/19969619913.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/89657487035.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/tolovupano.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450c5e6b3b1---62213290718.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/68027741793.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0i5a81bvmug3sj0otob606sh5m/dusajuroviperu.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/xunegef.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/40bca6aa3cd0a48ffedae6c7b0fbde9b.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/xolawexozexomefixivup.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/kosunu.pdfIn PDF document text
    • http://saint-party.com/media/file/2437426776.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/33124248789.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/nanolu.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/14771127874.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/vanowif.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/49797238840.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/zozenoj.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/19793327613.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc8bcff75---nukukasese.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/16737522903.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/selujuxezotesaw.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_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 10896 bytes
SHA-256: db77c632984b387cfbe5628bfc656dd889669c4bd92dcede2dbfe50ede338331
font_01_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AF 19560 bytes
SHA-256: d98b2290771ed07eebf93643fab4f466f340da5a3af6ceef9014b265bb86c85a

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