Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8af603e39c71583…

MALICIOUS

PDF

80.0 KB Created: 2021-07-28 03:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99f5054e5fb2141b07bb4aabcd1b12e5 SHA-1: 3cf5d5363625140770ddf786475a4b7c7f5a6c30 SHA-256: e8af603e39c71583109c1fbedcf35f5616104963dfaf30935ba8d1a75c40549c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, suggesting a phishing or SEO manipulation campaign. No scripts were extracted, but the presence of multiple compromised domains and the overall structure indicate a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6766

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://mygenius.ru/admin/ckfinder/userfiles/files/40367578183.pdf In PDF document text
    • http://dachastyle.com/userfiles/file/27542758391.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852b9fe78d1---jurezevufobol.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/33535593446.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/vepowo.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fti8f62inea6fhidbdr1mdh7pr/xapobuvub.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/tuleletolibor.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tl5o75vd10g2utbd1nope4q5o7/dusudijike.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210727210607.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f89e05605dd---tivumexepuwigojegidere.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bf5e4953f---24398256112.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/f240e53371524d4df986a93591dd9bea/80220291824.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0e33f2e18---91892231270.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984dc3c5341---36506811017.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7a21ed8f---parekuren.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/lebiwatosed.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/guvekijopatofikixapa.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/4412637329.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/pilexa.pdfIn PDF document text
    • http://17njl.com/userfiles/files/xetokes.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/wisedixod.pdfIn PDF document text
    • https://allianztc.ro/files/file/14155475801.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/af1b8f8d19cd35f5aae7cebe1e43e1e0/jakavewakekoginakepatag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=autumn+leaves+sheet+music+bass+clefPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 10668 bytes
SHA-256: edce930da74d845eb2c61798d2588a0fe48f6a4b17ab84a92eb023910413a837
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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