Malicious PDF — malware analysis report

Static analysis result for SHA-256 04588fc756cb87e9…

MALICIOUS

PDF

73.7 KB Created: 2021-09-01 20:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23774fe1403ae838dd5b50a54919d0ff SHA-1: 32927522ff725839f4bfcba1aa271ca34335abf4 SHA-256: 04588fc756cb87e99558a485964f30fd2b006b054c81e40d20494a8698393e85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The presence of JavaScript and the link farm structure suggest the document is designed to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • 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://willowslakerhea.org/userimages/bamexewadaluwupumutet.pdf In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ii9bbbsjck8hnbou63dhhlfl17/wokudenika.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c508a98f8c3---juwolokuziz.pdfIn PDF document text
    • https://bliznacite.com/files/riwubonejevaposumiz.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092df9e47942---japogukagifetad.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4mjm5bm68emrsu76lh6gerdtsa/54203387955.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160942ae6264aa---bofutaduz.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/5003632233.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/29466288359.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/mpm3cvgfsbgggf327r8pk55hn7/penadanula.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e921b3cc1b---kigewi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d6a6bee2---4276338196.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a89d61ee9---xidive.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608689edb0e6b---77821526239.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/lagoreguzuzinivamegava.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/kisokoxe.pdfIn PDF document text
    • http://ipceurope.com/assets/file/notisoxulekawuwugamiluta.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/dedova.pdfIn PDF document text
    • http://simonide.org/userfiles/file/94442861386.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/dufesukidena.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/076b7e04b95e5ab64951f645f559ca8e/befap.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/ruxigovirojuvop.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021082123505953.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/10966052877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=rotations+practice+worksheet+answer+keyPDF 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_off0000be6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6C 10760 bytes
SHA-256: a3f798d853ae95ec567576664f830962e1c4d2da1c3a7efeecc190fb3b478a44
font_01_sfnt_off0000d73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 16532 bytes
SHA-256: bd56c71fbb40768d41852dd554fe278b3dc27cae088c5f2434089fb3fb17fc20
font_02_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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