Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd81b351fca5ea6…

MALICIOUS

PDF

85.2 KB Created: 2021-07-26 18:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31b413a0f1a9b1361038040087541bb8 SHA-1: ff9896e823eaba19a5d9d902c6d9b554b5cf678b SHA-256: abd81b351fca5ea64443367c549149d1ddcb2da3b10255d5dd8e7ec14641c5d0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised CMS upload storage. These elements strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/001u1ofevdreqrirlt3nipnjau/loxaxujew.pdf In PDF document text
    • http://musclecar-taps.com/js/upload/files/88001361002.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/kedipowivame.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/10656262725.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/42285871372.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d95d66e8b8---60670878935.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/lalipizonokugemibonoli.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/39c543b90ae995bd1cf8015d66e7c3f3/rekiwanujagugibab.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/oierljidb1qbridtf2qfs6goj4/xopepepopezolalutoji.pdfIn PDF document text
    • https://www.nlg.com.np/assets/ckfinder/userfiles/files/rutekemipo.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6e7a9aa8dcc2aed3ef67a8f5b1c2cae6/32184636835.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/jau0o3p1n3g9grrvadgb5r5cpf/zinokidama.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/8c4bf1447c9ad6539996d3217290e5ee/34161520652.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/firamiru.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ff8bea78d---59190983361.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lifapukisoregisigofinewew.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/mamufelekafukepevowutese.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/79967878893.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/menewitenivev.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/xaxudas.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/53443071874.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a58d4ee6eb1---36241903927.pdfIn PDF document text
    • http://fsanaq.com/upload/file/21070418021177337693kv3k4n3gg6.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620893854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+check+imei+and+serial+number+on+iphonePDF 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_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 16744 bytes
SHA-256: d91d4519cd5eeba02a6c945f8b51f17614d87db87b54f0e59d76727b78b9f3d7
font_01_sfnt_off000115a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB7 11188 bytes
SHA-256: 512bf5ca1e917afc8335d79e785bf3a56c78b60a7dbeea9f4c084f5e5c83cdfd

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