Malicious PDF — malware analysis report

Static analysis result for SHA-256 a645a61f76e8b95b…

MALICIOUS

PDF

115.7 KB Created: 2021-09-01 23:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d90c51fec6711e9efe8e4c10f67963ea SHA-1: 79514f4675f5fb2b406a8e783d7ce94e614c3261 SHA-256: a645a61f76e8b95ba6591ff58dcd95ce314a8ed92bb1efd59eb6083817a61bdb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lead users to phishing pages or further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://oniceh.ru/uplcv?utm_term=why+i+overthink+so+much PDF link annotation
    • http://rogo-rotterdam.nl/files/23295302190.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/sijuferikunenoxodus.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a0d2482917bde511c5d7662cc25b4154/gevoxuxuxorenanebet.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/n8q9g6nmrh9idt1r1rlkmpuqns/xuvenesiwexinolufifekiga.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6a34ed48---63819052467.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216713524883.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/ritokari.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/povile.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c243712cf0---20956613882.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/35325798601.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090a1d95b0c5---64071116013.pdfIn PDF document text
    • https://hsse.cl/files/bevituvomimaworaxiwomerev.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/nativezobariduwesataz.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/61079460627.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/99614188992.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160722d151beb7---sifejoja.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/mesenus.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3vnsivnrh2170nqiruuh0djgcf/bofofinukesuxelijafozawe.pdfIn PDF document text
    • http://hasyo.net/files/file/falamejuzol.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/9d05d6037de347ddc774cf7e731533f1/wagumuxinifobuwu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60e0b46f03---40999207847.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/wagenegilinoxol.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d999e056f1---wixarotetej.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021070707233673.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000162d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE8 17716 bytes
SHA-256: 3500fb597c3732bd1931fb29b51c89c95be380c5fe4c4e389f7f7bf5cd26a05e
font_02_sfnt_off0001a866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A866 10652 bytes
SHA-256: 66da4dce67df66a98434a17730bf2cca988f97f6497e6a5574f683017287a536

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