Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0053a49c8f8e29…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 08:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e942f8d635b3d77138ac545baffdc81d SHA-1: b6009ce36ec467bce4e95f869bdc75dc1c7fcc34 SHA-256: 8b0053a49c8f8e2903a9d82f5f9da3a31b8146406ba79f9c05f3f11c18da208f
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute further malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8284

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://myflora888.com/ck_files/files/zumup.pdf
    • https://1tlstar.com/storage/uploads/files/dilozofasulosevorexagemak.pdf
    • http://captaincook.hu/userfiles/file/jumuloresi.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1ca0b25b0d9c411b4d864227ced71b88/89106786267.pdf
    • http://tienhasteel.com/app/webroot/upload/files/jerukusifudafu.pdf
    • http://mrspk.com/ckfinder/userfiles/files/pazuvevadodezadudesasa.pdf
    • https://4wheelchile.cl/admin/uploads/file/68784244409.pdf
    • https://wodepcb.cn/uploadfiles/files/40643093832.pdf
    • http://bckbytow.naszbip.pl/img/upload/files/rujigenevugomanobub.pdf
    • http://camonetinternational.com/files/file/217858112.pdf
    • http://yetisirkaucuk.com/firma/files/tikunusoripuzebu.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/263d27465e3878dfe34b631e27354cac/85990229581.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16131bf8153a1c---sogogu.pdf
    • http://kleiberit.ru/files/file/tesumagosaneduk.pdf
    • https://abzesolar.com/uploads/files/99508032270.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/vetev.pdf
    • http://ccspatti.org/userfiles/file/pazebowotikuzulivikodotan.pdf
    • https://www.ftha.org/admin/ckfinder/userfiles/files/1923553646.pdf
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/98727453002.pdf
    • http://matsonconstruction.net/userfiles/file/jejaniketupu.pdf
    • http://dexgerm.com/data/file/userfiles/files/vadejuzatig.pdf
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/gububisoritipikop.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/24302755245.pdf
    • http://crosswaysrecruitment.com/userfiles/file/fisafiv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=acres+of+diamonds+story+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 16792 bytes
font_01_sfnt_off0000f8e7.bin
5ccfb442a8e7f3e9e6ed32b043a46a9683b16d4d4c0ecf8b97764e957d62138f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 19056 bytes
font_02_sfnt_off000129d3.bin
be4d82e464fcd665b9d695d9a83e7e4ae6241d81de19223c60d89d5bb2cddb38
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D3 10828 bytes