Malicious PDF — malware analysis report

Static analysis result for SHA-256 4712c92c1288f8ca…

MALICIOUS

PDF

86.5 KB Created: 2021-09-03 01:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b017c5cd3a2f7fa826b262da103cd08 SHA-1: c6515bf425119344a7a09d91e6303b5b4183d7f9 SHA-256: 4712c92c1288f8ca1048dfc100312a38edec3bccfee31eacbae6281d97d9f0d1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to distribute further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7098

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.
  • 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://tokyoto.pl/UserFiles/file/72873017179.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a70beba5aa9---82476787576.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e4c26bffb---fomiribigolivuxibijabe.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161253a321e394---72422397674.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/bejs9ms5uh75jmmiv0lmqt8cfp/merixizefosebuwizemegepiz.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/12213313152.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/bg1pf0dspbt1j81su5jito6gkb/binanavofiredu.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/47105766093.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7bfee1a2---42625826549.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/31249582229.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cf5f44ec3---nuvalomita.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/23460801138.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/32497495194.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/29692015733.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/5839454909.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/61975050207.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/pewivoganivo.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/gabumowo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd99e8d7d6---loxef.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/36240106410.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/61732295067.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/dkl3cempsskrtuqq5irul4fpeu/15126083662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=anabasis+st+john+perse+pdfPDF link annotation
    • 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_off00012ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000146da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DA 10800 bytes
SHA-256: d0695da0b8a00824a953c52340516906a5a595c39a86de3bed34b20375c7dd5d

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