Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8e7e4d3c8a207e…

MALICIOUS

PDF

89.9 KB Created: 2021-09-04 17:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe52329c6a5f1b7eed37315aa4df7718 SHA-1: 357fb8cf10a5eaff7c1ae46c2fc78827ec40bcc0 SHA-256: 9b8e7e4d3c8a207e25e796d63ab99d9a0afaa6e1f6fc2afb1109f3eac8098f4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://relaxzenter.com/uploads/files/38394979490.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8adc442b280b135b60cf23b089aafe20/tojesotozatomometozunawu.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841bef85fc5---dazosegovelusobu.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ed286bef0---mevuxemotemudakifi.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095bc5c30b60---14529439102.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/31312050453.pdf
    • https://publicbridge.pl/userfiles/file/42050513503.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5876ae882f---86952053765.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vgtluv57jtu4roake353g1bvv8/vafenisapajezevinenupi.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16129464221f0f---dimosekurinakajojoli.pdf
    • http://medicom.pl/userfiles/file/65650224438.pdf
    • https://pristineleather.com/userfiles/file/pijaguxajodogiwugonapogiv.pdf
    • http://nanumed.ro/uploads/files/19824422666.pdf
    • https://dbjadow.pl/attachments/file/kabifuwimorofobimu.pdf
    • http://sibaco.ru/ckfinder/userfiles/files/favirusamujosefok.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/18220919357.pdf
    • http://xn--e42bt3l.net/upfile/files/kiwuromidigureromavi.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a508bb2a613---37985148869.pdf
    • https://tylbm.com/Upload/ckeditor/files/27474990657.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3568cd6b6a---pafomineledeka.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3a84bf58---56177366974.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/95321109333.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06416a9ae---xozejigulozituxofil.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161202cabb55f7---mulisafuwesi.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/s7eprl8s66tfj0jqtcq3di3i80/kitawemoxupusojipu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lpic-1+linux+administrator+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_off0000f647.bin
e09aaf78991d620438f0d698d84612d54d8c9f2287c1ddf2d82566c4533816b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 19052 bytes
font_01_sfnt_off000128f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 16792 bytes
font_02_sfnt_off00014109.bin
7f736819afbf92cc1d148c4bfb5301caad44cc527042fc39a699eeeca33e58e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x14109 10896 bytes