Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f63d79243e253a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-21 21:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: aa4e13f2b951607199d62591e5844d0e SHA-1: d344b7dd62f1a477692dd60613c00501844e43f9 SHA-256: e6f63d79243e253afb93dfe5d7d7d8013c67758a261ec9e8b795790b70285519
126 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The file's structure and link farm behavior suggest it is used for phishing or to redirect users to malware download sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2818

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://kleinschadenexperte.de/userfiles/file/57340075453.pdf In PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/wifamusujonos.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/tezulikupatomoturo.pdfIn PDF document text
    • http://efrex.cz/files/file/67759292091.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/66490197265.pdfIn PDF document text
    • http://superbarter.sk/media/file/22866129655.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/19195510089.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/18190203023.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/roporabudamunezesurog.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/97843368136.pdfIn PDF document text
    • http://fitviewer.info/files/file/13221416609.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/93706449570.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431aaab7c31---13009077087.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210916175302.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/totifube.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/tejov.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/vevotejixogen.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/34368969670.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613017c96f3ed---1701741045.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/xugatabimisamupafe.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/94408722990.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/rasegivetekiwixabomifop.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394d364a2af---nuzenemon.pdfIn PDF document text
    • https://apelhijau.com/contents/files/7739643302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=elements+of+style+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD69 17904 bytes
SHA-256: 10ae6c788c4c355e80619ca8f9f9f43a249e906aea9a5274bde8482d79b8c652
font_01_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 10404 bytes
SHA-256: 677ba17e7591c466fd570ff900ff498270e1737b892b1b164c30a80c7b5156b2