Malicious PDF — malware analysis report

Static analysis result for SHA-256 908b128cf255a943…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 10:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e5491a93293efbf6495bc212e2831fb SHA-1: ee9149f6c8c511097227e592c11d6e7a6ab52ae9 SHA-256: 908b128cf255a943ba1de7874a47cb71bfefefc31e49cc089d6a28c4822914bc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://kartywspomnien.pl/uploads/assets/file/62938309000.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099ccc3ce656---5332047124.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16085c54e2308f---27904449882.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b31dfa7109---tigawatewavadodewe.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c04f92fc5da60a1b24a60e74b0d54974/74234491120.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd790cfc53---64239274821.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/138475dc2fd7a56be905f40d1818552a/doxotevijomeretivabi.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7d217f325ad3ff8c67cad38ee2289b4d/60375351324.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1389cda583---16802563504.pdf
    • http://yule-sign.com/upload/editor/file/20210529202151.pdf
    • http://vienhung.com/webroot/img/files/kidadobisewemi.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba624fa1471---delagavepo.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/4d78cb877d98c2071cd047f0f2f13ecc/15327232123.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2df2594d0---8144876609.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/5154d20ebcc50a79bff1411d92c29a43/61786786032.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086e318ca15a---motemitadijezifi.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1d5a71dcdc9a5f511fca5bee79683197/vikenagubakivafitodaruj.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/f1dc746f4143a95dc1e682cc161ca936/34910133074.pdf
    • http://pushgroup.lv/userfiles/files/visugepikusunewimozux.pdf
    • http://muzeumostrowiec.pl/obrazy/file/lobugedamaniburisuj.pdf
    • http://billsky.ee/files/file/71449598971.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e1c4bd9b8895b6e74b893a999a9717f6/vopek.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609683fd4813f---jonusurogoboxoke.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/66414515780.pdf
    • https://aldurra.ly/images-editeur/img/file/11344202504.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607998bfa0cc7---tikudixaxusolodogot.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=covert+pdf+into+word+document
    • 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_off0000ee93.bin
11fda3a21e656ed7679cbb2b141add39c08302fa1bc05cdf82bca24e15e9d878
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 16580 bytes
font_01_sfnt_off000119c0.bin
07ec5d41eb9cbcc701c88a2b5d931707d1c80092dd294ca1031a0371c7b72f3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 10688 bytes
font_02_sfnt_off00013251.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 16792 bytes