Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ba793b0435fc3a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 17:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59fe0a22b463b2ae5d4debc9910d9ab5 SHA-1: 2281b243513b76349c39032ee47a1752ac2908c5 SHA-256: e8ba793b0435fc3a256aa37e1d594689b6de7fc8f0d65360c227d5fd038cb197
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://laborke.ru/uplcv?utm_term=dpi+normal+redmi+9 PDF link annotation
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/82791973554.pdfIn PDF document text
    • http://raczcsalad.hu/files/43013030463.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/16810284434.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/toginuzuromat.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/lekedi.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/putuwew.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/gugumumemerugubisoduseg.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/61201234736.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/66740958644.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/tobilerebusigexan.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/topulexugagum.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/99147173032.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210904002544.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/dexipokoxigevametidagek.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca7d3cfae---73358801322.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/xefudezonexa.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161361d3a45dc1---62613647594.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/12119337615.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/64128055072.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142bbebc433e---32324630742.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/18510609863.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/farevij.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/70875290697.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/togvs6g7lt1qco8l6ub71sfsi2/34002780565.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/84919618294.pdfIn PDF document text
    • 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_off0000c69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 19492 bytes
SHA-256: 2f5e25d4b854f0d644e2672d740d3ee87ba87cee1ed66ecaebc2dfd9b6758842
font_02_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 10456 bytes
SHA-256: d72aebda0cd25c9edf6d64676cc0c693553cb7727228ce6a0939553cabb6a61f

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