Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5feabbaf5b0444…

MALICIOUS

PDF

71.1 KB Created: 2021-09-15 21:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a02b0024f0c5325700d8aeb6c9e36c45 SHA-1: 538e91ff8d3027fc7707406d317bcdb3ebfa0cc1 SHA-256: 4e5feabbaf5b0444b53e3b1b4fbf571c038b2d4fb757525b32a99101bbf9270f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains embedded JavaScript and a link farm pointing to various PDF files, indicating a phishing or scam attempt. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document is designed to trick the user into calling a phone number, consistent with callback phishing or tech-support scams. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wic-net.com/userfiles/file/70344122161.pdf In PDF document text
    • http://hytechplus.com/userfiles/file/85508568754.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/faxobuxosigusanefexetawer.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/77103354238.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133bbe505d5b---18695050439.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/55293117523.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/42778335972.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/42117004090.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/86316342559.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613976ce1122c---42021335810.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/banitabite.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/wokire.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/xemolidatemuguworojidoliv.pdfIn PDF document text
    • http://szpk.hu/_user/file/48344614168.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/5u7ivs9c0htcnnurr4rmckrmjq/17901448516.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/52045448823.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/koneguvap.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e1c31d76009556503e8d8a932a1c09b6/80341168196.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/seniwulaziwaxojaw.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210902_15_21_13.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613352044f2cb---5306680741.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dbe0919ea---naxovusawarudelesen.pdfIn PDF document text
    • http://elitvorota.ru/f/file/lomegunekaxejoxawep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fast+charging+tips+for+androidPDF 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_off0000b7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E5 15248 bytes
SHA-256: e4cce8f8e98a249d51797112b5a5845b9ad69bf9fb914d135e25b3bb7f72ec1a
font_01_sfnt_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 10700 bytes
SHA-256: 55a6a36f2591502348f777fe63e172e0a3cdf2a0ff9058e383b8a989c19c2abb

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