Malicious PDF — malware analysis report

Static analysis result for SHA-256 72aca92b3fe02aaa…

MALICIOUS

PDF

89.0 KB Created: 2021-09-17 19:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce67f85df3e76db91f381778f793e6e8 SHA-1: 046d20e34a84dbd35a56ed5087ad2efa3d34c46b SHA-256: 72aca92b3fe02aaa5e27d326031dc152f665da8cf80c07fb5c61a524cb469bde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The document also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

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 https://wastran.ru/uplcv?utm_term=download+psx+ps1+android PDF link annotation
    • https://virker-ikke.dk/files/63661356248.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/fegagilokufifatadofi.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613f1ac066d8e.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/wovawode.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/1445553001.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/96149823661.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210912100427421858an8vw0.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210916_994B66B801A3C54B.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/54500328328.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/zijupepixolevuvalub.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e10e74027bc235f93e810de771562c37/wasegakowadiral.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210909_97A8A3B1A5A11A7C.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/wiwulonon.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/ramawilabiwew.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/lokaferenuloza.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1d33d766cb44a0f0b9ce7211cb165313/fuvavamesipimibawibaz.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/12147582400.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/65472859780.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/rupoloriza.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/1278389342.pdfIn PDF document text
    • https://naves.cz/res/file/vipevewebezip.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f05911538603e850437f826210807434/widezetilogusem.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-7/20210907221503700053.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138b1141469d---23174894586.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_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 10396 bytes
SHA-256: 8b85d090ed713739b8be296e4407715ea9cb95fbae266ff557be467e726690f7
font_02_sfnt_off00012784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12784 17848 bytes
SHA-256: 56b59cb3ef0b21a0f8b8bc8ad34d94f0a5a17af82847bc2f27785a698197079c