Malicious PDF — malware analysis report

Static analysis result for SHA-256 0528da715125de28…

MALICIOUS

PDF

125.3 KB Created: 2021-07-12 16:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec1a3eeac63fb7bfabb994fd621c14a3 SHA-1: 10d472674c0ef00e7f9990ff8fe5913be26da4d1 SHA-256: 0528da715125de28504121ecf484a6fc4d3450914d2a09c517e9ee2f3fc7c2c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://archism.ru/uplcv?utm_term=what+is+the+psae+test
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4270a9c87---rirumixezerakaguzotirer.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6283db2eaf---bonefotusiruduvisoz.pdf
    • http://cleangroupbd.com/ck/upload/files/wazokiruzoli.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/89498084401.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/9033172853.pdf
    • http://vladjurnalist.ru/archive/file/63766321981.pdf
    • http://robertoantoniz.com/resources/original/file/78988787741.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/j2bjj85mj7hqvifm0qk53k6ltk/96475394216.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/f984680e9a216f9d24bcc6bb42ee2e91/58049597942.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609de47fcb903---mufosuxodolokomazowosi.pdf
    • http://fogathajtohirek.hu/fckfiles/file/322613936.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/85777377280.pdf
    • http://andlupa.com/userfiles/file/luzixulaz.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cec23be3f---73831571848.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8144b094c4e8cf240d5f7609e3a73f21/ganim.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16083104c615c8---fexarerewedejow.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0634b5bd---gurewimatewawatum.pdf
    • https://veljun-ldm.hr/files/rugadinu.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87620356881.pdf
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/roxotafiw.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a79781c5a---28076534362.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/apuv8ukkvm4o4eee0u6qefpaf4/59824757710.pdf
    • https://ags-car.com/upload/files/mefemenemofi.pdf
    • http://guides2alpes.fr/uploads/file/33508379813.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f37ff6d8049c65663463a49503fc984e/polidobukujirulozokumi.pdf
    • http://sosnovgeo.ru/userfiles/file/10401964392.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/81957e2q41jl9rc3rv131irhd6/29156401316.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_off000187e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x187E4 16792 bytes
font_01_sfnt_off00019ff6.bin
140fbbea4a6ccda0cb2ea84c5e358c7096d85dbe0e068aa4719aebd3f5319347
pdf-font-stream PDF embedded font (sfnt) at offset 0x19FF6 19256 bytes
font_02_sfnt_off0001d12c.bin
e034edbfce76c0bb70052728b16f2d9aad53a88399394b313fc5f25700889f63
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D12C 9972 bytes