Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd7d15135f46db5…

MALICIOUS

PDF

64.0 KB Created: 2021-05-06 01:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 596942bff84cb40503724c892bd50c78 SHA-1: 3e6fc6e071f1594fe62bf90d7c94226023f9c472 SHA-256: cdd7d15135f46db5a15042093ded1793ee55a1490c6a80847eba24fcead00b28
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into phishing scams or download further malware. No scripts were extracted, but the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8518

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=calendar+2019+greece+pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/72d02e617f9bc0027b522bf8df6a525a/23669650383.pdf
    • http://strandedtattoo.net/file/10838720017.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775a4bad356---mulalevekuzaxuradibajawir.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/dabd6330d65d0e91d68c0b75b1b43a7f/vuturetolinezotogili.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c22c5442528b5ad92f3c9b2f287d9677/26684419874.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d159d4512---33114205181.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076056311da3---zefixajiv.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773e59e251d---rugunux.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d7b4ffff7f95732ff035439fe660fac0/rapamadajenajufu.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/59f5e38320b276fc0d462843514f19be/doxajegugisulugaz.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f63e021c---97993132547.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/4gi8uoj6bjlbmjgfp66dssipcp/89172152063.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13b13f14b---52690555561.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d11cd07fd---welozarapojilizefudaxek.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/f800b4015038510061c168741213929f/78939240370.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde4.bin
8b1770d44d6345758127816aa4f631b76ee55370bbdd723129894043d6e708d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE4 5532 bytes
font_01_sfnt_off0000e0c9.bin
7ef13d92d235a3362907658bdf534b8e8c82fe16811016394c48c823d7144c4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 10152 bytes

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