Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbd7b44ec16ce1f…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 01:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 765faa666c4a3ea640ea31ff2a15a779 SHA-1: 62c888c82a7094298739ccba9fd3dce904764de4 SHA-256: 2fbd7b44ec16ce1fe6194e743c54f0a03cb7e450fa2cf89c9d3229af282c7cdc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure by heuristics, suggesting malicious intent. Multiple URLs point to compromised or disposable hosting, likely serving as part of a link farm to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate this is a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://dienlanhlongan.com/upload/files/mofibasadejudiwizenod.pdf
    • http://kursadowicz.pl/Upload/file/17243821124.pdf
    • http://teenmag.cz/userfiles/file/95324753094.pdf
    • http://ledins.lv/cms/file/demixexizujekug.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/99272375728.pdf
    • http://www.arborvitae.cz/ckfinder/userfiles/files/1470094512.pdf
    • http://dentistturkey.com/image/files/94690429747.pdf
    • http://ciarajewellery.com/editor_upload/file/63571688844.pdf
    • http://gardena.crazyrockinsushi.com/uploads/files/71441118970.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0cc8e572---69990880440.pdf
    • http://eot.mn/uploads/userfiles/files/rasol.pdf
    • https://alkirbilaw.com/userfiles/files/ketufovapilixasem.pdf
    • https://hunghiephuylog.com/upload/files/pijezaxax.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/poximazidol.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/kasaxefewoxinenufeluwa.pdf
    • http://gjbbang.com/userData/board/file/kewapevopikoruxi.pdf
    • http://www.workbythai.com/admin/assets/images/welomalosawadatetawupi.pdf
    • http://digjamaica.com/app/webroot/files/lanoxedivedokixiwog.pdf
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/7095731180.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe58fe12c0---dedogujitedatofowinenu.pdf
    • http://heyumpnd.com/userfiles/file///62890864760.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c43724a82a---6977588999.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nintendo+game+apps+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af6c.bin
f9c0e7de15bc610f54f8f9f57ba5ac6d944854af92af8a0058be31223a6411bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6C 10772 bytes
font_01_sfnt_off0000c7fa.bin
0782ab1be06489212900bacc491f1388aaaa052be6e13954803e62616ccc5cdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FA 13852 bytes
font_02_sfnt_off0000ea80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 16792 bytes