Malicious PDF — malware analysis report

Static analysis result for SHA-256 5401f503d7294fb6…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 14:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3e467b488122630c3a5ce337043c325 SHA-1: b0662332af26cf604f9a22c1f54bf27279072611 SHA-256: 5401f503d7294fb680474cf2f6baede9883f3982f318f92dae1b4e266f9c07fe
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support maliciousness. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 9

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://steklo-shik.ru/userfiles/file/74104785064.pdf In PDF document text
    • http://cafegreenwichvillage.com/uploads/files/86780740457.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1rf3pbcsvu46qqacpm6a7dt474/subezopatitenepupe.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/82190099081.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/i6d2pb43db9v2h7j8d3tlmb6c2/17938294909.pdfIn PDF document text
    • http://foodchemsino.com/d/files/pitibivemebunikasos.pdfIn PDF document text
    • http://furniture83.com/upload/files/zujaxebudikutosuwabefu.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/60045401736.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc71dd1046---64244728035.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d52b1b905e---10334594463.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/45pv6e0n12lrto1g9m46r7etq4/kepiwukon.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/rofofolovaleluz.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ea13edf8f---88182478853.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/47f441191a9eb207e12f78c555b81079/rejodowegidagubamogoroz.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/xinazitarux.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/32878871538.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/95270031913.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/59577336109.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/0d3b6c7bb26a48255bf4642469ef2314/majamil.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/furusokogikogavejubamedo.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050317305973499.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/598f21a386eea9027622f87522f51c47/93969385682.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074596bca8d6---12839252989.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210524094330191.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/gekanu.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/74917349927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lenalidomide+prescribing+information+pdfPDF 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_off0000bdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF6 15408 bytes
SHA-256: a636e28080ec1a8dc65be1ccca469f3f87b71bfe4af60c1c1488d7a297c920f4
font_01_sfnt_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 11060 bytes
SHA-256: d04feb74099514f53e6ddfb9c37b047be0cdc7c6316e0c96b9b95c7c7f274352
font_02_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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