Malicious PDF — malware analysis report

Static analysis result for SHA-256 baea94e846929be8…

MALICIOUS

PDF

80.8 KB Created: 2021-07-29 16:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2c2b4605fdf3784c5f851368a92f2ca SHA-1: 806811f27a58517664ee4569904fb4a128d5afdb SHA-256: baea94e846929be856f90e5fa8983684354229451faa9d62311e5c954327546e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d1b0ad6ab---nuraniravopijajovef.pdf In PDF document text
    • https://hondamienbac.vn/userfiles/file/40633655329.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/nepijuvowenovel.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/99973460346.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/41945548835.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607775dccfbe7---11244532219.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809a752e6af---negegopulekavisunez.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/81863034117.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/bf69e0b4cc98713918a07150549ce651/18262688871.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/5380042147.pdfIn PDF document text
    • https://hoavily.com/uploads/files/58948245656.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a5e4454765d4978118b793db143419db/42180122318.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c972f72b10---20927087737.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/77180455545.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/woborenotomoromolalipu.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/42702465706.pdfIn PDF document text
    • http://ccsl.asia/files/zimakakateganuke.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768cd3a5d83---90733723229.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160721a627a247---jozusovutakekomabifidomoj.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c441d195a23---xijosuliv.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f8db8197f---kabukod.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089410722481---82406997204.pdfIn PDF document text
    • http://yilip.net/userData/board/file/paputinidatedada.pdfIn PDF document text
    • https://makenie.com/upload/files/74278481116.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/lisefuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+ethical+life+russ+shafer-landau+pdfPDF 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_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 10696 bytes
SHA-256: 693ce3c547aabd0bc4154a92658c33be60d3cbfebea455049da82d06f57230bb
font_01_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 17220 bytes
SHA-256: b5c57752f9e8712d1325cb7e546c48ba91728e44c62eb2d46228b61da5fe1dbe