Malicious PDF — malware analysis report

Static analysis result for SHA-256 730f695da82cb087…

MALICIOUS

PDF

100.8 KB Created: 2021-07-06 16:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3f8a39729d20bfa644073541f9c5f445 SHA-1: c32627223049e9639a994aee6be86a4716afc048 SHA-256: 730f695da82cb087477ffabff28ff8087acab1cb70205e5f8b6237e597bed340
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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 https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/d9abr9vmjldrmk6coedhmi4lvv/fexagukiviroxuzuw.pdf In PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2aef7f1c717c9e47aaf7aba3f4d13eea/miwosokofugoxa.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/nuzebu.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/91819858263.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a20b14032087dac7fc9380fa8a8009e6/15329097368.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/dejerekorowowefap.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/8781468886b96b5c2f3576c912f43151/wipemararodakati.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fjdg16t6k6522030hh34t3a011/16080935633.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ca44065113c6efe5b99beb04a84e1ff6/xisufitumolajulovisogito.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/maniwafelajopo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54c09cbe5---rarabitigu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b32bce37---87911141563.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608298011709b---kufunulakowivuwazis.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/6e94d52a99fb826026f6d91b940343b5/rirokagiwubidulezuziv.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cf7a7cbec---jonusup.pdfIn PDF document text
    • http://siembra.me/uploads/files/winoniwosuparipa.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/12147439618.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/mufepe.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f9e45583b---63329538474.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/83690419127.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcba6812f5---59316664427.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/gabenuxusoxineko.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082de875f624---rofafikojalif.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/2im7c9f4ifesbp869d7rvnt258/bawokarapapimotunikifab.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/13591059024.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f717e10a0c---bexodabazasodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=group+1a+elements+are+called+alkali+metalsPDF 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_off000124e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E3 17812 bytes
SHA-256: 96395de2ef0c33cf659a0980ac586ae39ee397aeaec07f3c821bbebb0414cbcd
font_01_sfnt_off000153f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C0F 10956 bytes
SHA-256: 82f235855b6886f57366bc50508935a6221fd032e3782d9d666ab33840efdf88