Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e45de0f7b692f0…

MALICIOUS

PDF

79.1 KB Created: 2021-06-27 23:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 22ba8768650df2505cf327c915715ded SHA-1: 504d18a3f80d6998b3422606d1630bafd9df3799 SHA-256: a6e45de0f7b692f06cdd7ca1ad297067540ff8c3532681cc3452ad699e7cfe91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to multiple compromised WordPress sites hosting further PDF files, likely as part of a multi-stage download or phishing campaign. The presence of numerous unknown URLs suggests an attempt to distribute malware or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7c7e3115---nidolivenin.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0d3355c2b---19606047756.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdad61ebe8---bofigumarekovolokiw.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/273c4bb47bc0b1d5141043aa4b8d52a0/pakivapapuzibamafu.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/1262437139.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/59134112423.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/46bb7f7ee367317683fc5702d7f14a63/29268232211.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tawesigodej.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/27867133071.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a3973cc8a192096929d69b0071663f54/rofojelanape.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/c83d38952ad7e123bb2f24313232ac00/46819883343.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd6bc3b832---84332298117.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/nipapevamuvozis.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5366cdc52---vaduforuxuzedetadopidebut.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160832727340ba---74926445089.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/eb9atmajvotd52tbh4hrn02u79/tisiduputosesaranenosopuj.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bda123aea5---tusorijugip.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6c5a30a4f---teviwokemebosuro.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/9747862929.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/700457e257906e5d68716db79a81c360/zatipijexunozidi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42e0f53119---19901405544.pdfIn PDF document text
    • http://furniture83.com/upload/files/47813347839.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54c6953c65---pufewomevugugalebelafuxe.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0840c84b70---fetijipalu.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/2769710501.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fcf4ae33a9cbcb1e3e05234e97a69512/54300335706.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-6/20210506095337872475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=flappy+bird+for+iphonePDF link annotation
    • 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_off0000d1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 10560 bytes
SHA-256: 8feac71b6ee8f2d912685daa3a3cd7f808542720362ad7b234c2df3d84827f91
font_02_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 16848 bytes
SHA-256: c1feb1fb8e66f8cf70b2207a6b14157e00a51963ffc8eeb1948553496e410092

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