Malicious PDF — malware analysis report

Static analysis result for SHA-256 3887c4f90c6d54a0…

MALICIOUS

PDF

79.0 KB Created: 2021-06-29 02:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cde0a7642cbf417ec799c5bf0de5426b SHA-1: 14a1e0743153913057084f9004d0cbd44e545966 SHA-256: 3887c4f90c6d54a0ce8050ad1c1874cc2fd558bd534887c98db122bc70377ba4
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection or download process.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4058

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 https://europawindow.com/app/webroot/img/main_content/files/dutamovobudaxipetokapeb.pdf In PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/13370588234.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/gixubir.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b00a52615f79d0e37e3ba7ef7dad03aa/81708848662.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8f81209c372b3de2633c5f6c03a8fee6/molig.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b821ea7f6---muponezig.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/78597397971.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c645a268c0---losivufemazolonefiwumoru.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16094513bba424---dusawadilixabudedutamizo.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/toduwineg.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/52307036040.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210601125425.pdfIn PDF document text
    • https://bczenekar.hu/files/file/18758383460.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/74ee7722f99b164314aa1d6dad872749/19365265779.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/50895069669.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/fepebiloda.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/pumuvinewamaruw.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/wutefozoka.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/308747fe79f673ee78c0df919d7c1fb9/7746398551.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/poremejuvurevakelawamuxil.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/8a43e22ff3f05ca9e9be71388ba19631/diwadapopovu.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/32343993988.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e75714f629---77061922329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+a+poo+out+when+constipatedPDF 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_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 10824 bytes
SHA-256: 97050276073739276469dc0c1f2f440ae2c44d1aafa8e2c8ba880831c62be72b