Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae28f7639ddb704…

MALICIOUS

PDF

87.9 KB Created: 2021-08-07 21:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6fea304ad6a72ff134780d7c8f8472e SHA-1: daf181feefe6cbf2f7c78038a270b82734844846 SHA-256: 3ae28f7639ddb704dce4a6ee0907335a5d8836e4bb743194ef854727e268e878
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports a malicious intent to trick the user into downloading a payload. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://allytemp.ru/uplcv?utm_term=firmware+mxq+pro+4k+2gb+16gb+sd+card PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea809d628---juwoxogepaxumo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161047e4d978bd---puvukuwivo.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/mekowedaf.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096348cc9281---mubexowoj.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/duxokeduropabev.pdfIn PDF document text
    • https://rosycaffe.com/file/49420922807.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/rumedodojofisomi.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/16187369516.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/29130757594.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/28207512797.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/0ni0sjt82sikk449ovu4v8m970/nofuludenavujokenale.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c332b844a8e---29642254435.pdfIn PDF document text
    • http://hogies.com/includes/template/uploads/file/mupomabadib.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/pibiwenef.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608358620bf3a---kivabeg.pdfIn PDF document text
    • http://furniture83.com/upload/files/sozosol.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b0d5b6d8---vodapixuzopax.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc17192754---19981411149.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e16a0252fbb9f87e6156738e8e195906/89044461499.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/86170970313.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/36667721151.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/58689318926.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e7d03b76e---33744232030.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/pezosabuvavapebi.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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 11568 bytes
SHA-256: a34923efdb14948fe50245e0e9b722f801e627876cacc9b72ab0e46b7c48f2ee
font_01_sfnt_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 17640 bytes
SHA-256: dc48076608a39c6dfe04071f21e60f05528ccf726a317ccf48551e24d1b2c8c2
font_02_sfnt_off000138c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1