Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8efa27512612362…

MALICIOUS

PDF

70.7 KB Created: 2021-09-01 10:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ebf5b70a1b9dbb9aa5c009c380b1db6a SHA-1: 90e31e1af20adc530c1ce93903125285b3be984c SHA-256: e8efa27512612362b258ba878bef2951488ecca057b93f5b6e34ad1ea0cd8423
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9463

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://szentistvanpatika.hu/upload/file/wagoran.pdf In PDF document text
    • http://mopron.ru/upload/files/xawidekipiminewobiwida.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/pomevesaperixajotu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082955e810d0---47361180731.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/zewapunoja.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/0hngk8t3k5dq45cabjl2j9lm0f/wepovajitakoxobokida.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/49216796896.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/gelajeru.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/59bu0jf19261d0l8drr1bgsiim/99260750595.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/90495430742.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210706065349.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/g1m8nl9t4nofqtkovqdr1eqo79/82562216355.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972dfe2bc39---pobapekebobojorenirefero.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/17053401592.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/bd9e8c023e0ccf5085c6f766f304ac3f/voximuwodidop.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/wodepameri.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/mipiwetevuvubiwozewajutud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6cd386d9e---wifesoxolirijopubikeki.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4a3d6eee79c6649f5baa919f4b9cf6e7/tomugibidokafoxelemixama.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/madorewuw.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/6091c4a9f6b81c425fd0ea9ac7535ea4/dunelizajetus.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/bc434ca4e6212895307ac2eb86d0a3ca/vexutibewezarulax.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/42704676774.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/67742426172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dsp+mcqs+with+answers+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/61861258679.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC857 18284 bytes
SHA-256: 76f364f8365bacae01330b324690f3c05be6c08e5ae13e1428835c081ff49270
font_01_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 10952 bytes
SHA-256: 5d7c5637ee1841437b380c2286071edb97555a04928f6972e0bda5f2c07dcf67