Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11bb2f8b937523d…

MALICIOUS

PDF

89.5 KB Created: 2021-07-06 14:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9506a78caa3f1b55676089e5d6ff3680 SHA-1: a1b27f68a5e2190a15fda9ae6c50e2e8abd6c145 SHA-256: a11bb2f8b937523da7b5c31056962d294c18ab63eee6256a6bd55d63d66ba5d4
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links on disposable or compromised hosting reinforces this assessment. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3d139d014---pinuwutonapofasif.pdf
    • https://ludifrance.fr/userfiles/file/18609789499.pdf
    • https://f27szerviz.hu/upload/files/koxereponadavi.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1855475ee---29841110410.pdf
    • http://toshiteriyakiburien.com/uploads/files/nivagerikuvufilinom.pdf
    • http://win-sonic.com/kida2018/ck_imgs/files/sukob.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kavinusobosale.pdf
    • http://spc1991.com/ckfinder/userfiles/files/nejuwugedomiwibod.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/80587619c4a2339505edabea1a3c3408/xudexanefilelivena.pdf
    • http://mynigaoe.com/upload/file/20210531210537.pdf
    • http://allamericannursing.com/userfiles/file/nibuzipevujavedapivofaj.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7be0acf5---sedowusem.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l9deucnls63fdjkrde7vn24984/67754716523.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/16d4698a283a58ebba469d455dd535c0/suwokimojematogixaf.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/4adcd7db7361cf4467b537df518c4b4a/fovelubomurasigokowit.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/debde11512ee6ee5c656fe44bb13563e/9527374933.pdf
    • http://drukarnia-skawina.pl/app/webroot/media/files/suvisa.pdf
    • http://granitemountainranch.net/userimages/xatufonabebi.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608512b85207b---pugorebozusazog.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/9g2uo7u13q9jc7v4mug4668uqf/xiperapos.pdf
    • http://orchid-daikanyama.com/userfiles/file/dunowabiguninagul.pdf
    • https://edenestates.com/ckfinder/userfiles/files/78618646556.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a75263c65aa---dibogatodax.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=counter+strike+global+offensive+wallhack
    • 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_off0000e992.bin
f8588d2fd8042111b44a686bc7a48f028e68af9bea959ea5b1daed369bc573be
pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 11128 bytes
font_01_sfnt_off000103a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 16792 bytes
font_02_sfnt_off00011bba.bin
d6f159ddba8db85ee6cc74ad5a872a29c7007a10c588e92a907818723380130e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 29156 bytes