Malicious PDF — malware analysis report

Static analysis result for SHA-256 d390a8423bda4c70…

MALICIOUS

PDF

104.2 KB Created: 2021-06-25 17:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ec9ea38af4a8472ff5931c6d2ba8b56 SHA-1: 618ecf90b0e9f3cd1bc9bc78a886e32470bcf02a SHA-256: d390a8423bda4c70f9dba74731cc82e57f74c83d8af6294e503fffec6e0f97b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/56358921249.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/dk79lhtejk709q2rtv87j2rb3j/likixuxa.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b8199fa42a44d85442ea973bb5332b3f/dejaxoweloxujisunerame.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4719c46b0bf49c7017887149cacb4aa8/kakipe.pdf
    • http://pileshoppen.dk/userfiles/file/65057392927.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/qit5a50vfnv45ihfdd7bt7a4a3/dedixo.pdf
    • http://babamoleskine.com/files/file/xigaraputamegakira.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/96b9956f7ac3dae3d27b3836e41624e3/20740290732.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-15/20210515130354804674.pdf
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/taxotiwaditabuw.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cbd174dc0---sujewejozobam.pdf
    • http://kalikraft.com/images/file/76650417360.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/aabf2a3e5d5c772258407b6b7240a669/xesunekixukalo.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/8512bdb98f47685e7bc3e88c17b1a518/9220791199.pdf
    • http://yogo110.com/userfiles/file/50735576665.pdf
    • http://adirondackseafood.com/ckfinder/userfiles/files/71322557828.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f92ef4feffb082c10bc426845bb3b4e3/bukatowofiripufizusot.pdf
    • http://commune-bourre.com/userfiles/file/25483533401.pdf
    • http://www.ujepites.hu/userfiles/files/7427759254.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609464a3f1108---83112015818.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/93db7e83111ad166de88ec942fc48686/zorejawageniganowonoxe.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4cc098cfb---kivaka.pdf
    • http://didaconcept.com/admin/fckeditor/file/mejixurumonififi.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6996e89e37---falewugenitirowutosijexew.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fnac+remastered+android+download
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000100c6.bin
fb6bf94a97c259b00f123811c3d03902c4a260762b51341995c897f1ac60a213		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x100C6 20740 bytes
font_00_sfnt_off0000e888.bin
c9e598b1ac5eebcced825c065ca0898d97b0b5ea3747885ebe5a469dd328de90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 10596 bytes
font_02_sfnt_off0001243d.bin
71118b56e7f5f382a78215cefea40e73dc1355ba95e27d613c12ca035009aca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 29828 bytes
font_03_sfnt_off00016d44.bin
b4695dfed51f494d3e5aaaa92d883fea89281739b14d45a7e5a8c12ee1647a1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D44 3200 bytes
font_04_sfnt_off00017a1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A1A 16792 bytes

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