Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d85e17d013fcfbf…

MALICIOUS

PDF

64.0 KB Created: 2021-09-27 06:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 253c650da6fd4e304d37d418eabbc109 SHA-1: 29e8335ff680d2cc3fff0b58d2dd2c89a274a405 SHA-256: 7d85e17d013fcfbf1e8795a40b0b26af49854a9f76c81df46acb6070538f3441
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains flagged as compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7467

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://mountmoriahcamp.com/media/dulitow.pdf In PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/vewafizigumadijisi.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/kavomul.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/kakakerowuvum.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/37665062821.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/30200843374.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161445a9e0815a---18072316195.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/piretewigudasi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/de522e62ee00dbb8804f3667cea4609b/kobopukut.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/xakojofo.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/bupukulerezubemukut.pdfIn PDF document text
    • https://vitanov.rs/files/37984946033.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/60633036541.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/30549528489.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/82578668454.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/70616ccea646de1498d0913e3af0bc27/febogukovuzumenogumejetag.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/wutibagonavudifev.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/12700754738.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/37830670935.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142149ca1650---gexagagogumojozagusem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=introduction+to+real+analysis+bartle+solutionsPDF 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_off0000af7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7A 14476 bytes
SHA-256: 5d27b5926e60558f3d2ccad0b9ce7d1853eed63c759643eaaaf705abed439904
font_01_sfnt_off0000d3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 10668 bytes
SHA-256: e56afa34756f5e54230ba9d920de0eef21c6ca88c777dc8f4434fbda9ee7e427

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