Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc88c87500713684…

MALICIOUS

PDF

76.2 KB Created: 2021-10-04 22:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2128110b1a664d8053796aaa5a1dcfaf SHA-1: b0b6a03e9087b570eb71305ff9fbefc8a6eb1ccf SHA-256: dc88c87500713684ab797e6aaad631c925d115a965d5929bc8839de08a5e0528
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the structure and URL patterns suggest it's intended to lure users to malicious sites, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7421

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.
  • 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://rw-hse-businessconsulting.de/userfiles/file/fatozelumadufeb.pdf In PDF document text
    • http://the-bom.kr/upfile/files/morotevobebabupukiwumozo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2vhkvqaj5cb4g91l78ls0l2njn/zowopelibuxuvufe.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/ratemi.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/23729815014.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/76299942097.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/0c999fb84d956b18de152afe4909f930/xelepivodanikiru.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/66395049889.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/615369015.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/sanofubemutof.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/xifarur.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfad3645da---bodogug.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/58300959314.pdfIn PDF document text
    • http://potya.com/46302026513.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/16407425067.pdfIn PDF document text
    • https://znalac.com/userfiles/file/94153446796.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/losawaditen.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/9919249089.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/suxupipi.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/48342523573.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614112d5a341f---dinujigabelosizibamare.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/gixipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=intelligence+questions+and+answers+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_off0000d148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD148 11080 bytes
SHA-256: dd026940874ea843a648a73d253881de5e02008dd4b5315e7aa55bb80d4c1fb6
font_01_sfnt_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 16812 bytes
SHA-256: 4e07dfdebf0518521250f3bea3f1944e96fefac604553bbd19d1e50cc38ce6ed

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