Malicious PDF — malware analysis report

Static analysis result for SHA-256 da889e47ab27bb9d…

MALICIOUS

PDF

76.6 KB Created: 2021-06-23 14:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dbdd525710fa6a38874035c239feb009 SHA-1: 4aacb4841e8087876f5bb9c6847a8a461517a7c3 SHA-256: da889e47ab27bb9d15cc4ef7a32917fa57e7154b6b29da570de8f542d51abf2c
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload storage, indicating an attempt to lure users to external sites. 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 heavily obfuscated, making it difficult to determine the exact payload or lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a033bca133---15974718267.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e3c54f161---rowerewulal.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jokowomugatoxofexodebava.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607551a36e1e8---besisujuf.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0da720c5---gexitowaforodes.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d8aaefd1142bbedc8ce2e83f87258f05/wodup.pdfIn PDF document text
    • http://attlas.center/userfiles/file/6219932829.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/43287340836.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/kisududokobanedadal.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a157350e2---liridivafuw.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d39761bc---3343842661.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/874ffd200ebb74721760c172200ee430/doborukexutibesepumikaf.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/e310b7da4ba2180d203c3e7e371b4684/rojasufidakubu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/97379a16ed7c315d5e97fd3ff9b6c281/zetef.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/29965afde43032db5ea7b4fc25adbe40/70183887680.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/xetikofajuf.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zojotewaxurutodajituvubem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+go+apk+obbPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 5040 bytes
SHA-256: 3185a5e724bf995dff933821614a30a6f530df5aa8f43d879512cde0de783d01
font_01_sfnt_off0000fcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD1 11912 bytes
SHA-256: 0321f2b6e79dc4717a99ed9c76869c99620465cc4f87b21eed1b173b0441b09a