Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99c937c3f7aa9da…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 10:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0dd9d6dc4d2dda0d321b05d3c1673270 SHA-1: 06dfb9d4b7e4529ef282c8b47ebf9c7dc7f22fde SHA-256: c99c937c3f7aa9dabb603126bbdd2fdf57d1956a6abbca1d31634f5a1296b795
204 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to deceive users into downloading a payload, as indicated by the 'SE_FAKE_CAPTCHA' heuristic. The document also contains numerous links to potentially compromised websites, suggesting a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pietroquatriniarchitetto.eu/userfiles/files/40708278427.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613248e5aee4b---77652448987.pdfIn PDF document text
    • http://favourtec.com/attachment/file/47254002876.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/80278345308.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/vikifusimoxeduru.pdfIn PDF document text
    • https://derfo.info/resimler/files/jukesovedu.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/67141257233.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/zoweropufopigopofafexim.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/mosufuxubokubenilutevubu.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/gapilazawowum.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/kaluludogoviju.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/nisofonujibaponalevon.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/zedigatej.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2c46907b368c393fec1a5bf4d922a588/rixolisijetugedomuve.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/wopudizabekadesitapu.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/junafunegarevive.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/84427343084.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/kuxajejuxagopixexof.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362cd424bb2---lulepemudowasuketop.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/wasamoxuraponosozixo.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/aea92eeca8563b2648f27ce73390186f/jupilifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=all+possible+pattern+lockPDF 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_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 18368 bytes
SHA-256: a2def68e4a38a1bf7c4f6eb5d24b761df8c96b3a293a162492f35f27c19982ff
font_02_sfnt_off000122c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C4 10580 bytes
SHA-256: 182f9abae80d2ea2e89659fdc226a58514c2cdda3752257989eb66996c4601b1

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