Malicious PDF — malware analysis report

Static analysis result for SHA-256 c594f3c627c301c9…

MALICIOUS

PDF

106.6 KB Created: 2021-08-01 17:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f43b53476aaf2d239ce61addf0a67b35 SHA-1: f462afc81c04f82fdbc2078e22c68ed571940b31 SHA-256: c594f3c627c301c94c02bd26229668439c74e873e177ad27c828c37fe0718f99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/240763d89f04b2a0f2cf4f4e01a77efe/39296001291.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/8acafefb4d8b5e3fdfd1e9f5f5ca7743/fejukodipizu.pdf
    • http://banghetretruc.com/media/ftp/file/subuxawiruvo.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/31518019180.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/8669b38f439bacc3f6686b117d2b2897/diwugibisowetelalop.pdf
    • http://personnelstrategies.net/userfiles/file/41247384380.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dapirusosoginazokutez.pdf
    • http://wajl.net/img/file/202162671834.pdf
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/18371088650.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/98684397763.pdf
    • https://betenenergy.com/sites/default/files/file/77168518967.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/2060535081.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/3i0dgg1mevp6upkh75qnpff9u7/91751420740.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76c164a7c8---61099352136.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb66019b1b---1822337245.pdf
    • https://actor-conseil.com/files/file/90040946855.pdf
    • http://palazzodiaz.com/userfiles/files/mewiludozofasudowetomuta.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbe2e512a0---bavozobuwalaparapa.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/tn1nd92j0viala3mo7o2quos8j/72995562197.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/e1676edcf340dd03799d6299cff29250/34379488924.pdf
    • https://condicionamentofisico.com/arquivos/file/51475111543.pdf
    • http://dui-antidote.net/images/userfiles/file/xupasekarojefubufufonesut.pdf
    • http://abnicum.com/files/file/93053284160.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/90tti0p3lek9mgajlc7i2vsadr/tofaranutekori.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=chart+dremel+bit+guide+pdf
    • 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_off00013a53.bin
a29b7c70bcc3222a3395a4e78f10ff8277341961253fdb60b61a5def10a43702
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A53 19164 bytes
font_01_sfnt_off00016bf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF9 16792 bytes
font_02_sfnt_off00018410.bin
0f4d303f04acee268c3b438ebb515e65f5ccbb71d9560d18bf09a47158568cd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x18410 10824 bytes