Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8e44c111ec619f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 05:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb1b65874f3e4c343b04916e9d428727 SHA-1: 85c85aeefcb2777b8b18f3c3c3fe43981b84eab1 SHA-256: 5e8e44c111ec619f8da19457d9e335219657d8c4e065360de25340e310a01021
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccb3869e17---makemiwopulaz.pdf In PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/kvir175947eop7rl9815c0aiem/lunuxibusu.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8f82463e40c74957d5bc0bfbf3421487/teroruxuladufi.pdfIn PDF document text
    • https://ferropula.hr/files/49563777523.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210730_E5669A56DC3D0166.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/11921148713.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df6bcdf36f---suzumox.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/88144955972.pdfIn PDF document text
    • http://jackyrouxmethode.com/userfiles/file/12003299181.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/1719800000.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/61741797212.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16107e12768da3---xufenarebumoforugexozixip.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160aacee1acb2d---rebuzigodugikukajime.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/d2d8caf1f72395f58bc4ba7a86bd60a9/nerebumupetur.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/fogitanagemu.pdfIn PDF document text
    • https://aedwea.com/upload/foto/sazakofesozafezexivejiv.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5bd957bf---18067480561.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd7ed0d976---sosukejax.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/23541219984.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/84315399208.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/86760835342.pdfIn PDF document text
    • http://mmt24.ru/files/file/64680194965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=spread+the+word+aboutPDF 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_off0000b6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFF 10480 bytes
SHA-256: 2b48d372eace59fbdd4d9c78c8a2914f0a7c5b3df26238b78d4772b7452dff3f
font_02_sfnt_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 16128 bytes
SHA-256: 8c68468a495ab4a65658dc9bb54c401046467a5f2aaddf3e32712ac5d343a050

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