Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d070d1df63a626e…

MALICIOUS

PDF

93.9 KB Created: 2021-06-28 00:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dc862614db0e6ca072d47b5ce5c3ef9 SHA-1: 8cb091f988e06873354f6d34ad6f1f2e3018689d SHA-256: 4d070d1df63a626e515a2659673d326a270f9a15feb5596a9025671600264d61
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/19pscioh42c46pnk0eklscj3d2/67646353053.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609495241ca34---31835189367.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea01a79bf---dawanidemifaxarubakud.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-5/20210505233139666553.pdf
    • http://agendaalzheimer.org/files/galeria/files/69749344683.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa88a43a0---34960674828.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a447140a5d---vobapudefot.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382e38f922---tukenadurowuzutomeforupa.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55ff02606a---58569725671.pdf
    • http://simkoongschool.com/uploads/editer/files/votumisifirurezexediz.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a270d6823b---nusemozezime.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b7172b5aec8dfd7c53cbd371be94c42f/xixerik.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3b60da19e---vavisavogikojuxofawefeku.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/47839700826.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/k12ot53ksgh0b11ho75r0ip6fs/45292225278.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16083bbb8530db---dawurobedagupitu.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da90984bbb---29236917339.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vd3pjiovmdkd0e320hd4ef25hg/zupeme.pdf
    • http://purofirstli.com/userfiles/files/65371364391.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/vmp5rgpldseses4ki2v9c59jg0/14154915134.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/22230d408a00cad515a83cd2b66f0782/10696354292.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/5710470132.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e611d8de57---63040289221.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9865d019f---95591385064.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/38db7da283a271366548cb2157fb344f/55748198181.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/08056d04172d5bcd05f358b1d1460a7c/91521518251.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=peppermint+oil+in+tamil
    • 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_off000101d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 16792 bytes
font_01_sfnt_off000119ec.bin
7eaa7943c11a06d3e0ac104ee1cb6560c6979e5ad6309b6a5dd83b647a588c4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 10244 bytes
font_02_sfnt_off000130d8.bin
4fd5208aebd2623400c6763c5fc62ad51941dcaf548b8fd3d52221aa5ba2b712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130D8 2164 bytes
font_03_sfnt_off00013a42.bin
517ee5ee3b88dff70a157ca3f8c2e63a61d16008ef1c428e9fa8fd5a2e2e7d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A42 18216 bytes

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