Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12261f4638706e2…

MALICIOUS

PDF

77.7 KB Created: 2021-06-26 09:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63503e0e043b7ea5372f1da969bee2ff SHA-1: 5d0c75472808c86a6cea664cc344951f6351e39e SHA-256: e12261f4638706e2cbaebb781eb4ab873dea6705a97098ec9da1a868162deb3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://pappteam.hu/userfiles/file/dirazubekevor.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1d1c1d6bd---vigofizeb.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900fff7bfc4---jugufanuju.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cf4bfb058a9e7fb40f6671a6dd636d37/pubewajawonisa.pdf
    • http://scandirent-new.ru/uploads/assets/file/4681559611.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/751ad3d91b7b42eaff5245b8bf870126/sadomogutiwexaxetu.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16074758ac358a---80745005835.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160892bdd2755b---kuxodoberodafoxuwup.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1f2b48a4c4baf561ae1c5340852c4191/49700204993.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f5f9ec26---kudufeligonure.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/a30vu43somd6kjpovkmnq5cq7a/48794301401.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/jujata.pdf
    • https://nexusmediation.nl/files/85876011550.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/tpsa9v1n7e5ki1cod47igcb9cf/43003504716.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9681b81af---76572025699.pdf
    • http://accronline.com/userfiles/file/27758892881.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a3c12e571---60185610354.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/dotbn37mu6ae1snrg9m3p4sg75/11270681739.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a6ee72eda3591abe1508a8bcf90a989b/magetinukuxuzimu.pdf
    • https://wegofa.com/userfiles/file/kujoduvisotanu.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/82116167779.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608646da8a2ae---funexave.pdf
    • http://ztkammer.at/uploads/file/fukuxosenew.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a7643033f---73232198140.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=word+to+pdf+links
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 16792 bytes
font_01_sfnt_off0000e7f0.bin
69906a8e52bfcc1ebce88d0a844bb0dbfa4ab7d2ae896d7025be59b3843954ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 16284 bytes
font_02_sfnt_off00011279.bin
522576106d96b0b8530731087ce349a8ee58b887184d81bde910776b215a863e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11279 10284 bytes