Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ed3ff4caa75873…

MALICIOUS

PDF

75.4 KB Created: 2021-08-29 04:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7cab41514a3fe697ca99ed500a656133 SHA-1: 6b1a56d28cb9362ed6d32bb0cc31f119e2746a0b SHA-256: f4ed3ff4caa75873cb76d833a8029cb7e312dffc077f2996f20b719bb547c0a0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of a 'Fake CAPTCHA / human verification prompt' heuristic suggests the document aims to deceive the user into performing an action, likely to download further malware or visit a malicious site. The numerous embedded URLs, many pointing to compromised CMS upload directories, reinforce the phishing and potential malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • 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 http://oresteruggiero.com/userfiles/files/dadilimekifeka.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc80dbe88f---wegenumedadim.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa86a964c6---62575686700.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/srd0lage3ov46g5f6c2iuuc1je/pezarenogovana.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/41976749479.pdfIn PDF document text
    • https://iohrp.org/f_files/files/89091623849.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/64458123964.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/topikureju.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/38214823949.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/69420462924.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/fibowolitoruvilu.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8b5fa9295---15419801861.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/74721893605.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/kutalenimiwusazunib.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/35b77c3e5979e646166fa5d13a038ccc/jidavimanosefirof.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39fbe5351---39294932445.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/zulizovetutagaraguporuve.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee2fb198dd---jizugevevuto.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/2212422735.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/31526762980.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/56186592953.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f01d683bbe5e652b137730468556d965/pupeximitizumole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=impact+meaning+in+tamilPDF 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_off0000bd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD517 10280 bytes
SHA-256: 76dbec3bdd76b0e044d014affea5a501e961dc15a8488a227a89ae568c6b8565
font_02_sfnt_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 20776 bytes
SHA-256: e7dfb3b29eaf9b223acee2691c396832d6456a70b33bc14b81abb7ea1b4d4ee8

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