Malicious PDF — malware analysis report

Static analysis result for SHA-256 6101b8c792070f79…

MALICIOUS

PDF

87.2 KB Created: 2021-07-05 21:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdd3866da848f2ca06e89d7914de32cc SHA-1: c41425cf3af534cf023bd7e30de5e328d80e9fab SHA-256: 6101b8c792070f798dbe7120b4403634eaf0449485d6ebf33ce1fe1ddd22b749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, 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. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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/mpdm3mdfrg22l4u1dbe1fklpi0/nunaronifazusep.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab41daceb14---37925600408.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b74798c3d02b403cd7225e3f7d1da906/nuwosuxukakagida.pdf
    • http://www.irrv.org/uploads/files/82291057185.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/3e3aqonm2241gl268jumn3d942/nekeboropimoxobijogar.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607deb515af0b---pezapumovanokekapojemob.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/44216295168.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7655982f---8011430355.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e5d410ae6---76543253766.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/79c314c96d65f3a9f2f4e67cd10c3078/zulodotenezaxatogu.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/36c801e69b14a34433f71fe9831b347c/kilopami.pdf
    • http://stalmont.eu/userfiles/file/xitobuparaxapenelosu.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/sh4nm2jhf2eq34b54b271j476d/xexomoxaxamotuxivok.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/68800268ff3f010eccecb43dbb83e456/66753503144.pdf
    • http://caphegiabao.com/upload/fck/file/29651541626.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c1d95319326c4cd625f346888226c1d8/neninedoxu.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7ba773980---82897471870.pdf
    • http://robertoantoniz.com/resources/original/file/79920304885.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9aa85e3709---80525820363.pdf
    • http://teplolux72.ru/upload/file/28379881365.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/2830f5d30f0733e842237f37e981814c/mobakazevelipetuvowen.pdf
    • http://rauvuonsach.com/images/uploads/files/83720164347.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b105293b7---xedutever.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2246a2fcc0---tonosujewatuwokijukolupok.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/p5f61lgsbsp8mn913k3rg719v0/bolanofabi.pdf
    • http://chromowane.com/userfiles/file/27472068197.pdf
    • http://cke.hk/userfiles/16617868930.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+fix+a+low+pressure+faucet
    • 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_off0000f3c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 16792 bytes
font_01_sfnt_off00010bd8.bin
92eaf2e711061f1b16e4e9f66cadeb66885aad7d99377fab64d199fce62489bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 10648 bytes
font_02_sfnt_off0001246b.bin
8493403a76a6019226a9750864b644c84fb1a2a24717d3d47d17e61898b3301c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1246B 16584 bytes