Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a909b544805bd9b…

MALICIOUS

PDF

98.0 KB Created: 2021-09-16 17:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bf9a797cf3978be13ad7cb965e106c0 SHA-1: 1d73130be87ae7f07a566c87195060a8fa680f60 SHA-256: 7a909b544805bd9b3fe9e809e15b181f727eb7f40ef5fa8edec04013533922c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The PDF's structure and embedded links suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://infoegrafica.com/userfiles/files/bajufatuxusixewuxifuxekuv.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/n1i4cadfj9g2itaqoo6opdnj5v/raxijurizabujasobaber.pdf
    • http://koreaseowon.com/ckupload/files/nasopanukodubegafipirese.pdf
    • https://pasationtravellers.com/root/FCKeditor/file/dezolajozar.pdf
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/divojamanazijeraxunena.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8c168e655---sunisod.pdf
    • http://phongthuydotho.vn/upload/files/ropojo.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/sepujoxixogux.pdf
    • http://architettoannalisatinelli.it/userfiles/files/27450410067.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/40672111210.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2e2e3633e---zonulamewidutokulirogi.pdf
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090922203480554.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/liwumusutupuxaz.pdf
    • https://newtech-utm.pl/userfiles/file/xijewa.pdf
    • https://tomorrowhubs.com/upload/users/files/62907849596.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613059229cf15---dugifo.pdf
    • https://synersys.fr/contenu/file/tenokujurejutovidavola.pdf
    • http://bettaletroom.com/file_media/file_image/file/guvivogelezutenamezopa.pdf
    • http://beiks.info/public/file/19139042836.pdf
    • http://soupworld.de/upload/file/gifafajikaze.pdf
    • https://jensbrode.de/files/file/rijenot.pdf
    • http://newo.ru/files/files/83844961460.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3df6d90dc---69141388709.pdf
    • https://ibexquimica.com.br/ckfinder/userfiles/files/sonebumutomesemad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=123mkv+hollywood+2019
    • 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_off000119e8.bin
b8bf10d66d6b05a3036a37dca05e8f105a23ce75e9f23ffc614b75fa334e93a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 10552 bytes
font_01_sfnt_off00013204.bin
ce810843e79692ee2999078e8b62926f7dba27857a38bc69897af1971189fba9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13204 18424 bytes
font_02_sfnt_off0001626b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1626B 16792 bytes