Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5511bd6233180c9…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 05:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c123f38ade39731c1fd0425d8be6526b SHA-1: 4de17e845f36d9c43299a2f30589cae8256f2d8c SHA-256: d5511bd6233180c9fe7759c1b6d86b1f358415e204e842f7a6b9465eb30d114c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on compromised CMS upload storage and disposable domains. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a8eb30cfc---lelodokebemerowanojoveriw.pdf
    • http://mofrantech.com/userfiles/file/63415641323.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cc3b7e7dd---xozalijidogonotekakunux.pdf
    • https://cahayaapi1.com/contents//files/rosuxave.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af2bb5992f9---71445539495.pdf
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/viluwetezu.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/833565a2cfa1e383c861ac25d4ceff82/xinesexigi.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756df5c4936---70392724991.pdf
    • http://historia-bfured.hu/userfiles/file/34798553958.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/72eea70b185850fe654f6993c7d19164/41094762799.pdf
    • http://eros-arena.de/eros/userfiles/file/kejavilinerinuxasizikuzi.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e3488c28---pobemeporox.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b5f37b44---75796252185.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d3b50bfe73ac296a4b0d35fb2b1b198f/47486349794.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094932f79d17---fodidukerekawafujud.pdf
    • http://przedszkolenisko.pl/userfiles/file/90641400254.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836686bfe9d---xikosuguviwavafidenufapip.pdf
    • http://adamlegal.com/userfiles/file/raterugedupexolajopufatu.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160739a909c410---buwazixupibudovorukavo.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160939f48b1a1a---wifidimasexatapib.pdf
    • http://atenngo.com/admin/sites/site/documents/35453269055.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/ojff9unp0e66rr7dslm7vu3une/legububokuzisugovovojux.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab3850fbb---30005522156.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b76bb93aecb4792f0d4bb31d70dc7308/70919585640.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/kdn2qq7n6ndk84kvil6asm5e63/guwakukup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=a+chip+of+glass+ruby+answers
    • 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_off0000e955.bin
80a4d4eb0ba4ff6b9ed5993ce72468c5e1c3a78ebc9e514bda53492d97c056a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 11084 bytes
font_01_sfnt_off00010302.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 16792 bytes
font_02_sfnt_off00011b14.bin
004ec9e938c75768fb7f8cc08a68619b351c09c57bf653728ad67accf8c05fe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 17448 bytes

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