Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36728e91eeeea53…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 11:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc8b2aecddf5ec118adf9465972a4288 SHA-1: 50e57daa1361422a59e6c9eb7801444d8fe10abf SHA-256: e36728e91eeeea539e5684dc8b75959d260c8ca28a5b51cc5719219e9d14168a
156 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and an ML classifier, indicating it's likely a phishing or malware distribution lure. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious intent to exploit users via compromised web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://n95america.com/wp-content/plugins/super-forms/uploads/php/files/448dc9270504c1f78a93e1c4502a6d08/53287101295.pdf
    • https://georeno.ca/userfiles/files/kipeperitasofosif.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73837148623.pdf
    • http://dichvu12h.net/userfiles/file/gixowetavewusup.pdf
    • http://langeline.com/ckeditor/upload/files/8398662121.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd401d5dea---30827655853.pdf
    • http://etabetasurvey.com/userfiles/files/55410792454.pdf
    • http://agapetown.net/ckfinder/userfiles/files/rutumuken.pdf
    • http://ttworld.hu/uploads/content_files/files/xesoxivelilawuvow.pdf
    • http://thebankcardservices.com/uploads/files/92473679862.pdf
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/soxavisazijezidoxo.pdf
    • http://bancasemecanino.com/userfiles/files/nikexujufumosusigafikosa.pdf
    • http://kimdaiphatsteel.com/Images_upload/files/68567432109.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073937ac1c98---48944269610.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab3b2c23c---32657746027.pdf
    • https://bjsteelvietnam.com/upload/fck/file/sarubefo.pdf
    • http://vinhosnorte.com/images/files/dobefubokovotowokozaletes.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a61715b0d22---dexojevelijuxawuwenaf.pdf
    • http://master-br.ru/img/file/xevisepel.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcfa254f3c---jekowekotesepaj.pdf
    • http://cainghienbinhduong.com/uploads/userfiles/file/filagedoxemiboguvakurutor.pdf
    • https://zerling.eu/nico/images/files/papuvaguxajusefiwi.pdf
    • https://pmms-online.com/assets/file/besadizuwidaludavapedirim.pdf
    • https://sieuthigo.vn/upload/ck/files/fiwelefisugabolisafidat.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=glibenclamida+farmacocinetica+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_off0000d7a9.bin
5ecff14b20e699c8a063f4b0686d886b701a801f3830eccbe6c52fb55d9726a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 18664 bytes
font_01_sfnt_off00010880.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 16792 bytes
font_02_sfnt_off00012097.bin
3d3bc2c6f932bb539b1dbb1f2479be5b50d8f34169a175d0bc17d2b441bea655
pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 10792 bytes