Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e41af1e3a4cc44…

MALICIOUS

PDF

84.2 KB Created: 2021-08-19 08:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 54403c827a051ca32cb6af76df85e1ae SHA-1: 411bf897e49a9e192d691532fe4fbd00b558b952 SHA-256: 72e41af1e3a4cc446ef664bfd6ca50b05ea39b8250e928084ac1555b567270fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=o+hobbit+uma+jornada+inesperada+online+dublado+1080p PDF link annotation
    • http://tramtronbetong.com/uploads/userfiles/file/15290671219.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/balusajivonojoruzev.pdfIn PDF document text
    • http://techbis.pl/files/file/nebew.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/61316241207.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/851ced190e08f9dad2fb79e9a98dd1b8/mebexewutejakar.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/xanolaxegusutekiz.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/gulomi.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///zuzazoduvovas.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/wikisifimuzozekogiporez.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/219aaf3d8a3c1615e4c14252ea094956/fakolelesemunera.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/mudemalumixolatebeba.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/9b8c58143e9f38e3cfb471e0d2144e5b/xapejosamafonupuz.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/bf0a926ab7cece519386cdf47b957941/79759213664.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89c568a82---72679748559.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872c238b5d1---86739041769.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/9799462934.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074915ea6cbb---60243893761.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d698a5b211---49895875027.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/jumurufoberisewax.pdfIn PDF document text
    • https://digireg.ch/upload/15082586150.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef9c3d73f65850d0ff8918db9f293898/38643340805.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/potunulozukatozokoz.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/bexuforugaj.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/a3fa8299b6d1a6d56ddbc4b512863def/85809486202.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e885409325ed653fc889fe7eb93f8a00/85020380065.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_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 19136 bytes
SHA-256: 51e5ad9056e56a1b1db760a7d8fad86b191ff6c5d478d4ff6755f2501a82186e
font_01_sfnt_off00010fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE8 11436 bytes
SHA-256: f37d3793b0d5b399ab26158906b2e5e8d32730d65805af90e822ca91def40b38
font_02_sfnt_off00012a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1