Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8ee01274fe514b…

MALICIOUS

PDF

54.4 KB Created: 2021-05-30 00:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96be125e61679994d8622f05e6ec2e4f SHA-1: 68d304a1aadb09e2117467dbcd9b27ce4c475ce9 SHA-256: 3b8ee01274fe514b1927529a12c45a4288710dddf5117787c1d711cd68e2d8f4
154 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The document body, though partially garbled, indicates a lure related to a 'technical course PDF', aligning with phishing tactics. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8886

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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3d96e8a052c1396ccc40d2f6b440ad62/nezilukogi.pdf
    • http://silesiacapital.eu/data/file/20344808655.pdf
    • http://bukharasuwanee.com/sites/default/files/file/ruwomilikaginagi.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f831e707---sekuxejizazari.pdf
    • http://gursakaryahukuk.com/images/file/muboromikefileketum.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/7e1dd1d2978e6abb06b654ac94f4e281/vilugifovibigajewatirug.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077631e0438b---wufokedipifi.pdf
    • http://liburnia.pl/userfiles/file/buvufukazidalopeg.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/8dj1655reivi5hjc2lt6j8mki8/54373734572.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/626eb6749c300b089cf34ad263c5e3d8/61957970130.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce5f538cd---lipefilasome.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/sh7jv6nutb211o6ghaso98ghmp/zazofipumedigow.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea1110b798---63890409490.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/3m0sabfipqt0gfc2jt0scf1vd3/nejorepep.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72ead09ed---1504553502.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=curso+t%25C3%25A9cnico+de+caldeiraria+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc92.bin
4dd5b8ddc79b2ec3c5fec7e5819fae716c85d0a332ac0e6b3cd2f27cbf22d15e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC92 5196 bytes

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