Malicious PDF — malware analysis report

Static analysis result for SHA-256 351221aa0f5a997c…

MALICIOUS

PDF

86.1 KB Created: 2021-07-19 00:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c63fffa0d67f8bfb86973eb3b4170d23 SHA-1: 360c09d6b5515d5af0d851c3af61a2ed64129c74 SHA-256: 351221aa0f5a997c9eecf7522872de64d05cec0d7566dd1c82eb8f860b753c8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farms indicates an attempt to distribute malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c2e1abe4c96045c2620491ed4ceaa867/bodinape.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160787489b70bb---66406726408.pdf
    • https://equator-maritime.com/userfiles/file/junakopuba.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a083fb95c77---kopul.pdf
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/12300819725.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ckjcg93dg589dc2juck5qo1ifb/vedunoxuwutemugusijoduro.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/36919982407.pdf
    • https://worldmedglobal.com/userfiles/files/dopajolotubabedipalo.pdf
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/pejine.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/2bo1qnlsog4pf6jpf560aobhqm/80186234640.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0451fb3d3c---jufotululakekowenuni.pdf
    • http://chayka-svg.ru/files/31822862430.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e0b80a85e---kojowevun.pdf
    • http://a-kamen.com/userfiles/file/vobukiwarevetolare.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a72574776d6---mevodobomiripusepo.pdf
    • https://muguet.fr/sites/default/files/file/81193945499.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/tekorudumolukamowekus.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/wofimoxipiberapuxaluredo.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/41c2060012db877f42918d7517930e7c/40994384771.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c7e28e6e3---mebewetawozupuninuvupove.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a50426018f5---54268365500.pdf
    • http://dlt-nkp.com/fileupload//file/tanimeliru.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/bd7366790a284ad1ada17a324e11cd91/wajivel.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3hqjdkpsc70njsgu8g8nac9nig/47127496538.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/35e2b456180b05d58aacf53e04f714bf/80765413912.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=geometry+1.2+segments+bisectors+midpoints+worksheet+answers
    • 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_off0000e852.bin
60597b0191e7b5cfb4dd3a97f419ac2792d2416e3cdfeeb1866c5368e2ff5853
pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 17720 bytes
font_01_sfnt_off00011704.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 16792 bytes
font_02_sfnt_off00012f1b.bin
c0034b1e7819451bc23d039663a547adef5914e1a03bc17edc32886afd71093e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1B 11624 bytes