Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9365542a9f72db…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 08:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8d68c145562cdb3051cd000e9935df19 SHA-1: 1d4a598462ff9825eb6738e4eeb91be69c491de9 SHA-256: 1a9365542a9f72db16bbf563c82b479229799dd6b7d04d6118644cdf780c3f4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which are hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=asphalt+8+obb+file+location PDF link annotation
    • http://stylekd.ru/files/wuxejifekedodibobobewixij.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/toxeza.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/gikapizomapugubinobokazu.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/zatoki.pdfIn PDF document text
    • https://curvy.tw/upload/files/17021459309.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/8631500129.pdfIn PDF document text
    • http://www.pilartangguh.com/file/bomidixuduv.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/negurogug.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/fakudurekataj.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/rolijufirimagixi.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/39919657133.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/grd69hjlgrnpu3r0o3kvsr01k6/gewepeguzonazugolatozol.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/23596415700.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613da87ede2b3---rasopebenik.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/vavajuvajuwasamutudow.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/gorexatiduzod.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16150657af1f05---wefogakokatukupogozifobe.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/budevemimip.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/ruxologeto.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/wilotodonivisotasegeme.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/76854218869.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/56925170898.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_off0000acc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC7 10804 bytes
SHA-256: 4247abecd8df093c470537939b92681859922e3ba3a88e29303a55f70c541fce
font_01_sfnt_off0000c57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57E 15272 bytes
SHA-256: c0f4c7893e43cbec5c7fbf1d7a9b131f89417c30c05faab8858e2dfea22f76cc
font_02_sfnt_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1