Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad8d51efe881ffa…

MALICIOUS

PDF

67.3 KB Created: 2021-09-01 06:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ab6a69628f951355b2098542c09ab52 SHA-1: fe067090d527691493c69a626092ed3a560500bf SHA-256: fad8d51efe881ffa5b574b1e924080ce0175cc9c94d9ae87753ca1b597377a01
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it is used for phishing or to distribute further malware. The presence of external URIs and link farms on potentially disposable hosting indicates a deliberate effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8724

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=soft+brownies+from+scratch PDF link annotation
    • https://kopari.hu/files/file/vifosurogisilibupakirux.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a438546ac2---limefa.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f762cbfffa8dea7f8773ee2b40737743/mafewivagosegufexeg.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/xomivogisafipaxisami.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e5361b395---ginatitemitabowotem.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/jonizuwugufasomugixituxe.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3abec920788a5a05fabf94d7eaaa4fc/36509409644.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/t9mflhtmj4lrejril42ij0vkhp/13836572340.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/97d2272fd80d9621d7f2f0d96a99426b/dixotut.pdfIn PDF document text
    • http://yilip.net/userData/board/file/fuvus.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/2081081479.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/milulamoxukekopoxo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b320e151758---vokirop.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079615157e1d---21022101572.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/97316785628.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610642225c18c---penonag.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/48636806cef8391c23fe4ac285524d6e/8392935815.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/57631813047.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/729b135d7dce09f39b6e2c4330ddaac9/18753667101.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160970d3075b80---wivegavujoze.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f31e5ee83e4---bamakutuwudezovelajumoma.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/svhfrrrkd3lqri0loivhfq00p6/36468862860.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1ac0ef08---92835879060.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 10856 bytes
SHA-256: fd1f2431cf0996629a0dc4f29fe249a563173dd5a464814e5608dacc2fdacdab

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