Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbedf57eb21f1a5…

MALICIOUS

PDF

72.2 KB Created: 2021-09-15 18:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 508a66b8b9482e1dc90b5b0cc19eaa02 SHA-1: 7715bcf41fdca7e45f7ee698bf0f1ed3229f80dc SHA-256: 6fbedf57eb21f1a5f575237537c2e16a67343b6e78b80b0dfba87e4bf9683162
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://movitecnic.com/ressource/site-image/files/dujoridiwutibi.pdf
    • http://duda-tech.pl/dudatech/upload/file/kuvametok.pdf
    • http://hairfibers24.com/upload/file/jirexefurinopivi.pdf
    • http://planetamama.ru/files/file/61673913219.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ffe1ed832---vabitavipemuzudujega.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210913_161706.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8c8083fff98be4cf9e792f8d8cdbab44/pisilopiva.pdf
    • http://n-production.com/upload/fckeditor/file/wesijijukejezitigizaxi.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/depovufibobazuresuxizemav.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ed7974f2871dae9b4265d21dbcb13824/77238755025.pdf
    • http://koreanhotpot.com/uploads/files/wusapavisotenasuri.pdf
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/79567380061.pdf
    • http://thebrownbag.vn/upload/files/1057475255.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e9b8d45974f846dae2d0694b4d9b95bf/89440706699.pdf
    • https://muacash.com/webroot/img/files/60019967667.pdf
    • https://vialivonica.eu/userfiles/files/75823520113.pdf
    • https://mygrind.ie/userfiles/file/49027061501.pdf
    • http://taichielite.com/louis/taichi/ckfinder/userfiles/files/79945952583.pdf
    • http://jamesandsons.ca/userfiles/file/1669569598.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4b822ddbe---69390064186.pdf
    • http://cleversystems.ru/userfiles/file/38300811376.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161320cbdb98ec---33960841638.pdf
    • http://vipforiraq.com/userfiles/files/goravolexiz.pdf
    • http://files.ibiza-ferien.de/file/9647186506.pdf
    • http://falconfam.com/ckfinder/userfiles/files/fuponid.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+application+lifecycle+callbacks
    • 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_off0000b8fe.bin
2024d50fb2de7958094a23ae0c2145bdf9f21dba9a8d80c4f8c9b848990de746
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FE 15856 bytes
font_01_sfnt_off0000e153.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 16792 bytes
font_02_sfnt_off0000f96a.bin
92ba148fb93aa99ad072011d7d97ec830da66eb27f6ddb00df6d33eeef5adb8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 10940 bytes