Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5216621302fe58…

MALICIOUS

PDF

63.7 KB Created: 2021-05-28 05:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7b53bb9b8693f450f463c90e2334182 SHA-1: e3fe2deb7d9cb0d55216faed6bacb8dc43a4dc20 SHA-256: 0c5216621302fe58669f07b6bb7e0bd7f13397deb1fc8aa782d39e1212f857f1
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for malicious redirection. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata related to PDF generation, but no direct instructions or lures are discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8355

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 http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adaa8cd1830---60519206417.pdf
    • http://www.hangmandigital.com/files/file/96602382988.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/4t5mjt4iima71t52pepj4pcfaj/37716889066.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b9699dd5ffff4c18571c494823ee5a6f/95821005138.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/adcb3d0241af63c9d48e4595ceff1547/tupatijaxukazowowo.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa5d4260aa---55216287.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/unju5i0470v5pb1qiqj2hvij1f/62695078834.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/pifigodawibijit.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/eif5u6pcbe45ic48rntfhivovs/tofisavukumurumumunoki.pdf
    • http://akinmedikal.com/uploads/file/10181638162.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091aa6fa5cb3---66815545157.pdf
    • https://abeess.com/userfiles/file/237822295.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d88ed41c5---pebosujeramozo.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc48fb94cb---fejebub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=collection+in+the+water+cycle+is+also+known+as
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd70.bin
3c1ef8c0a6f653f05efbdb3154a16a93b8b1a14798688689c582c11fa497da01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD70 5052 bytes
font_01_sfnt_off0000deab.bin
9a889198430cacfc583601956b9754878d6dc49469edb5292a8ee2f1135362d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 10408 bytes

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