Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e411e0c84a8c8e9…

MALICIOUS

PDF

67.8 KB Created: 2021-09-06 01:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 511d366bf4d511bcac1131c7c7d3366c SHA-1: 3b6ed4da65ae2fff6f863756900ac2b0d24bcc17 SHA-256: 6e411e0c84a8c8e91651cec80bd5e9ab41724b6facf2d493ddca1670ecf0f686
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the overall structure suggest an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

Heuristics 5

  • 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.
  • 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://vroa.pl/chplusfiles/file/74086209000.pdf In PDF document text
    • http://euredit-editions.com/userfiles/file/boxokuzevoxekumavudipizev.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/rcv6tqlr0f4jb0hise45f0tum5/23754576481.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/36951152087.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/vilofasufutusikur.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e984dd6780---nobuwadu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f14a0fd2---75851232516.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/16141789234.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af5549e8a5---51393787409.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160babbfc175c7---gawuwunaxuvus.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/wasovif.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/542cqv7d19h8qbkap3td6srogc/90949243130.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/46895404283.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/57245862548.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210826184859.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a75233097cb---78763171049.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/nuzewalomemamawijegepux.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/32349084734.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/gufesumitixedamakekujemu.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210806051444.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1df32bf6---vivevidobamekuxufizi.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/39584473341.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf90b6715f6---donububifofavodexafivoge.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/679318b81ad1e6e8f397dd4dd11e5373/28899660953.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/roxijes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cyber+crime+essay+in+english+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_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 11132 bytes
SHA-256: 4e07db0668c21f404eda85ae3657cde3812a03a607675ec886861cc8a4d1574d
font_01_sfnt_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1