Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1c6d2eea1189dd…

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 19:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdbf7ce041eb1ea4b8261d1a0fe52a75 SHA-1: 43302dfa9e9ddd890d88a5df19bfde49a492b480 SHA-256: 9f1c6d2eea1189dd8691f74bcbd1641edaeefc2793e79b8afb221ae2944c3bcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the nature of the embedded links and the heuristic firings point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=rational+and+irrational+numbers+difference
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9b52jkvrjjibjuruah0a54d6tc/28970234570.pdf
    • http://aylincinarli.com/fckfiles/file/tason.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d41145561---28642203181.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d94cfe47---tujamoruji.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/f9e6700f4b5e2b5caa158137047406eb/janemebuvopituseburesar.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e0424486ea39d57bbcb95131dc861d14/11389290897.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/susunavususibotipuvoziju.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f353af4c8cc22fe9f9fbeb5f7819fd05/33402849503.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/5oik7utug7t089c86bhror32e5/81766652959.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/0e027a709c12325d1db36bd355488a3d/69490511755.pdf
    • https://aspaeng.com/files/image/files/38997430706.pdf
    • https://mfdesign.hu/files/file/jasebesijokomofudadakopib.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/505d098aa8642318a9ca875ac9e0e738/80533199977.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7db137a82---gomuxove.pdf
    • https://alakharia.com/public_html/userfiles/file/89249691664.pdf
    • http://alphasigmaoverseas.com/userfiles/file/wegiwonufunidufarox.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/355881844.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d91ae4815b---kanokopuwolibugov.pdf
    • https://zionapostolicministries.org/uploads/file/38285553374.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf9c4260c4---8066472686.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bee218b6e38c84ad14c4d341d5f57cab/jukidoweterajox.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c05f1a64bd443bf2b92265afb91ec7c3/47083705131.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf0ac3cdb---97408403764.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e819e8dd7b---mujuvurufaxozawepusuj.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_off0000e22d.bin
9dd7353bd2f960f045547e926a2746bdf86c1a82963a1cc01af76c0babff22e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 10924 bytes
font_01_sfnt_off0000fb83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 16792 bytes
font_02_sfnt_off00011395.bin
989aae07d174e42575d5f5d08954d9f83cfea475e378bbe911c9727d58bd573b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 18092 bytes