Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77b124013bb8950…

MALICIOUS

PDF

78.3 KB Created: 2021-07-22 18:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78a6e5de160ef6a840b0314cf9aba45f SHA-1: c12c3562b4d2fc2b0cd5cb2346d783c92300874b SHA-256: e77b124013bb895060f687c350a177597ce2149eb69aba602cafdadba99cf600
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting. The primary function appears to be redirecting users to potentially malicious content through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9478

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://mariellatriolo.it/public/file/rixutefobebopa.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/48074742953.pdf
    • http://highendschmiede.de/highendfiles/file/buzumaf.pdf
    • http://alt-1c.ru/userfiles/file/30731990193.pdf
    • http://drukarnia-skawina.pl/app/webroot/media/files/10228591084.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4dec75211---divokebunafafonude.pdf
    • http://biosurfest.com/userfiles/files/tosomokorumun.pdf
    • http://qca.ch/userfiles/file/siwumasug.pdf
    • http://syuncyoku.jp/upload/file/35299037164.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d97a35d34208a7a96209a508789a5bab/rolut.pdf
    • http://activepymes.com/pub/file/mupeduxilavelozamopukiker.pdf
    • http://4grd.com/cmsimages/file/79228822862.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/841862a5166cd852ad1cc49917574721/23258617118.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/v4ffejh1pna359lhdvb0picrq6/78728920023.pdf
    • https://susta.vn/userfiles/file/67563119065.pdf
    • https://cape-electronics.com/media/file/jivetutifulalix.pdf
    • https://alutat.com/data/file/59830613068.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/8o2hr9vugta6o7jnomjqji4cf5/61893898626.pdf
    • http://email-database.info/userfiles/file/99813145959.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2279b0a9166c7d5b4b89299d35fe4df5/welexidujogesepoz.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/68629156356.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4925b1157e---kefofetosimaniruzej.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf268f500---selesakapubajeratulidevog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+long+does+it+take+barley+to+cook+in+soup
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ddd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 16792 bytes

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