Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7e1aa0502bfedc…

MALICIOUS

PDF

80.3 KB Created: 2021-09-22 13:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0f6af3a51e3ad1e100755f83c79368b SHA-1: 3348c6a5dd93c9561e5defe953cfa2fbc1ebd8d7 SHA-256: 8b7e1aa0502bfedc8c07008bed995091ac8076fe2c32c172756404258293ed39
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

Heuristics 5

  • 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
  • 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://wastran.ru/uplcv?utm_term=neoprene+density+kg+m3 PDF link annotation
    • http://www.gieskestukadoors.nl/ckfinder/files/files/vosab.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/12287347138.pdfIn PDF document text
    • http://roocenter.ru/upload/file/falisegemedu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141458dcb4db---wijawemumuvizi.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/gatozobiruwa.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/xusofipeziniditezile.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/58297558204.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/28380652436.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/23520384034.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/gumitibisonegidefuvit.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/70140034156.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/43197970585.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/77509691437.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/64944230361.pdfIn PDF document text
    • http://chapelguild.com/images/usr/lefizebapibafotogef.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/betitiwo.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/45477267601.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///97543899156.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161414959cef71---33726893356.pdfIn PDF document text
    • http://prompol.com/media/file/kudosotugobuxutagotejumak.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/xalijuve.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/30624063788.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/mezafig.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/sakezatozomapawuzipen.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5be831de1e9349068d736ab092b0c4b6/didosafolovadedakivegota.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_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 18864 bytes
SHA-256: 76b50523293af842d81773a4ba4125e2f670094cc340ff7f131f5ecac5f1c21e
font_01_sfnt_off00011788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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