Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88bea57030ccaca…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 13:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebfb7327fb354a89b7537e92d9a212ae SHA-1: cb83318d3336d4deb124328845187005ad4c1421 SHA-256: d88bea57030ccaca37537e7fd04681beb13f3387bd63ffffcdd26fab96d21ae2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO poisoning. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a3907b40d---60578249708.pdf In PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3a983847a8bb6170a8d9938126fe06a4/88832324779.pdfIn PDF document text
    • https://kede.org/userfiles/file/segodazufo.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6c42cab1aea393d7fe3b868727d3e832/jikozamivazifusagozame.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210720023203.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084f86260472---zuluwejokonifonope.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14b8910472---vidotugevosodisutojizilu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wesogetelinofabideze.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d40b995c0---29804494184.pdfIn PDF document text
    • https://podimercrm.com/img/files/lapitutusiresubumodakup.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160821cdea8a09---puposepazegidukelixut.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/95955007843.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/vikinajirup.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/mexebatugeresanuguge.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/14319379921.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/nutixunarujotuxibagoxeda.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/59830734560.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/bagijigigowudok.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d05d3b08a8517b968d0aade8edd59622/sajaxevomogumami.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/motozunodofunedixozatiwux.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160848788f0211---golanepajivu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a306f9f05d9---11555944188.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/33786158614.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/f4e9arbndlvcl8uqcou4qnq9ht/53443200620.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/bulakiwovox.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/59240434779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=infinitive+gerund+participle+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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 10624 bytes
SHA-256: 53fae95cc4fb7b4d79af31af1c47c206df020052263fcbd69c4511575a514e71
font_01_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 19716 bytes
SHA-256: cfa0ae91a6e4475b7624891e65ff4b91671d67c0b6d4cf49444b909c69e2037d
font_02_sfnt_off00012b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1