Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec4ab9521b1e267…

MALICIOUS

PDF

67.6 KB Created: 2021-05-06 22:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 641b10826b8fa9aedca9345a8b549c13 SHA-1: 0ef30f7cd92451e0c65622d2872217af93907eec SHA-256: aec4ab9521b1e267ff3ef39b4282cfe2fb95bd856331275fe4d24b1b913d6aa3
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8541

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/93ca0231b7f0070a57f2c3136c2ea65a/vesixozukelifigusar.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a5014c195---fugenodugidamudegere.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609411083441f---77909199745.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b30edb960---89785628979.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608164e9dba2c---ribozorokutazijodus.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/cfbe855c6230a9161d3ca104743e15e6/winukadezezirugosis.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/egpktdibruv8bk0gvk2nfb1jdr/27315362062.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/fc5c08d964a52b7050cea28b3b0921fb/pudetanamitulusumu.pdf
    • http://ahsaipu.com/v15/Upload/file/202151157469500.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/90b5a3ec5d927044354b9cb453948e95/supimoxo.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b639443f008fe463174d25ac0a23d82/24935868658.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/hnp17m88vucbhi6hv19f4kdd72/76942591927.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c8e3a7012adfea4af39858bdb5689490/revanulebufalurefivenuf.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/95d56a16212ce3ceec21e95a1e669b98/12349792609.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02bd89237---94674976595.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1f056783edbdf79aacc0eeadb148e735/11996021217.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b96807573---xapobizum.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607594933e274---jafaxadalam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=quality+bed+sheets+melbourne
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7cf.bin
75eb52c8d5d0d1b4ab9e9943046576c512b9132eb318b5411adff7657292882f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CF 5368 bytes

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