Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb4c6bfae211900…

MALICIOUS

PDF

112.8 KB Created: 2021-06-25 20:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 795200d9e34082f0e575259480735fbf SHA-1: c1d1db6e7e5394f1c6dd00a64c127e3c8effa6bc SHA-256: 1fb4c6bfae211900580e03dcbcced7afe40a66beaf58d75a9cb3b12e70b7a136
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/lcrp0nkq7olkqql2vicmuhflul/54979084435.pdf
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/83651191079.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62c3af48f---12501403991.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcf660a275---ponogojavowapulejanatogi.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a70495c7fd3---foxujezolopikawomejem.pdf
    • http://innotack.com/userfiles/files/84063548363.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/89b5a3a12fcba217b9deed104778b098/10925539481.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/qc8bamu8qu9m4orj810sfdbrps/bijasux.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/lolerejowo.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/6e88b32f209b38c2159d4e23188f5399/xegavopenu.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a9eeefab7faecd7f00226c097e375762/maxujagutevemelogabe.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mnr1m7ps39dm02f2e1ka774krr/68010142462.pdf
    • http://sushinamu.com/uploads/files/58523335889.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3f1c405d---13410630237.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1909e9386646183d6d55ca88369e623f/lajesamolakin.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9170e937b9b1983cbde0c75deb2aec01/93784730021.pdf
    • http://www.awakohchang.com/image/upload/File/ugasodaxilinapodazukuba.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b80e89848---bixiwuxulilipakipit.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3cc07f6f5---vaposelusuroruwapugakedi.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ba38b0bfdce---99580211094.pdf
    • http://lucann.com/Upload/file/8729112690.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19b98393de25fdbca272d5051e6f34dc/ginajiwer.pdf
    • http://banghetretruc.com/media/ftp/file/xuwamepekozadojoxi.pdf
    • https://htddienstverlening.nl/userfiles/file/53303086837.pdf
    • https://iveducentar.com/uploads/assets/file/boxebexurexoxapomazu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906e9e404f8---68569966156.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=calf+muscle+fasciculations
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f54.bin
28c1085e50661b6c43682f7703a169522e91ce1ab24ec1eb307ced478cf4255e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F54 17796 bytes
font_01_sfnt_off00016dbc.bin
089b9b427e162edb08e6fca5413e20849a4d80a29f1716cca5fb1f6e15165b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DBC 10528 bytes
font_02_sfnt_off000185b9.bin
9d7f842f431cea2e16910d6770151554261f03bf07739cebeb636f0063641530		 pdf-font-stream PDF embedded font (sfnt) at offset 0x185B9 16680 bytes
font_03_sfnt_off00019d02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D02 16792 bytes

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