Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52dcde14979451b…

MALICIOUS

PDF

88.8 KB Created: 2021-07-15 16:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52a42371f71aa11303da0b6d389b198f SHA-1: aa17c948bd8684ab453a8bf5e78c4c9c03bbab0c SHA-256: a52dcde14979451b0de7362884f20c40840aa2dba2fa9630c7aa44dc53016311
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/shqml13e5mq4sukpgr5dbr9foa/gotafipotona.pdf
    • https://x-software.cz/data/file/rifuseziwewibovu.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e39354a3c---4204921310.pdf
    • http://briarcliff70.com/clients/874901/File/16628131205.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b882a30829---88153148448.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b4802f62214ae29edc30dce7648c1997/36722429655.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/119fb9f5e408b17b54eeb02db39f4321/loviwovapopesojikuvigap.pdf
    • http://promador.pl/userfiles/file/47879563616.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160943ffb55dd0---kekotasora.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0kk0s2t6l2kp8bj22oe99q7pp5/88743119673.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/8kt7gkan4n13sj7l2up746evc8/gubevoporapuw.pdf
    • http://akssert.com/userfiles/files/sozudunuwolab.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/caf714fa6dd2fcdc5b6d654d667fb00c/lidavevusoputapamu.pdf
    • https://bagstyle.uz/images/file/kabazoz.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8291cde049144aaef4140da3c2b56435/27271323192.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6b795f15c---73069126788.pdf
    • http://akcjonariusz.com/UserFiles/file/sumawuf.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a000bbcb57---38904738429.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/c21c2f401ee1a793b7da990f2318d9b5/kaxeweropodapojajufupeza.pdf
    • http://tubietelbar.hu/uploadfile/wopuwukikiwuralonaz.pdf
    • http://teraval.cz/res/file/56072306126.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/b0d3b13ffe0f559653aad8d5ba156ab6/25819750216.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/de40e4de849b1eb146f77a1c94167a86/xojokara.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad9ddc162c---nijozagewifapusa.pdf
    • https://schmitz.cz/res/file/11198774392.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=maybe+he+just+likes+you+free+pdf
    • 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_off0000f6d4.bin
f837c68684a1dacf57704c69d3519ce368604261f6026a8f249bcab8a16545dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 17280 bytes
font_01_sfnt_off0001242a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1242A 16792 bytes
font_02_sfnt_off00013c41.bin
f5d0bbba41bfad60cfe81f59c6da4df0c2967b33dfd44cefb72bc71851cc517d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C41 11060 bytes