Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d45efa2018b59f2…

MALICIOUS

PDF

85.6 KB Created: 2021-07-19 09:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d5f2cdac38f57ff2c70a32fc0f1e921 SHA-1: 1b1cb84aead06f9b4b9cdaa7780ee45853c8eb80 SHA-256: 3d45efa2018b59f26b3473b47f628ea95eed53a505175ba7d487bc53f4f12670
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links, many of which point to compromised CMS upload directories and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0de1474368c3672e755455efca65b13b/mejifexeb.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/bojezadevomezuruwotepor.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/2889p3s5h4m61d038g9q1koe87/zevuxudinago.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a2ae2dad284fb92e8d81e6025d608b0d/duvabumejemajibitubewa.pdf
    • http://aep-tc.com/cache/fck_files/file/8364179446.pdf
    • http://frezerovka.by/images/fxeditor/file/94380937936.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954dace94b1---jufiwifizokuginakuwoma.pdf
    • http://beautybybelief.com/admin/images/file/97121353073.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2q8i1b0vq1r90bgjiar93b2ibb/70729981823.pdf
    • http://sillajen.com/fckeditor/_upload/file/jerez.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/f6mo7s9pin03pa4hm2vu4gkfjf/subavozi.pdf
    • http://vogiantinhmach.com/media/ftp/file/xikigogapagifezonojojon.pdf
    • http://abbuffalowings.com/uploads/files/zaxateduluxominile.pdf
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/71678444455.pdf
    • http://thefjordbaklawfirm.com/clients/876731/File/xogazuguka.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/xotirukakar.pdf
    • https://larioenergy.net/uploads/file/66862157506.pdf
    • http://roxburyhs1987.com/clients/63080/File/81294458227.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/jf5v20oeh5i5hk7ts3sp3fkl7l/31415944622.pdf
    • http://studioindelicato.com/userfiles/files/silavufodugudeteke.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607346153517b---xuron.pdf
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/4005147842.pdf
    • http://mackyz7automotive.com/js/upload/files/37805503018.pdf
    • http://eltonltd.ru/sites/default/files/uploads/33750896746.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cylindricity+definition+in+gd%26t
    • 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_off0000eb81.bin
425ef55f6c6a14fb1885ddc63590148fe06773dc177fbaa12b417fcf5b767312
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 10464 bytes
font_01_sfnt_off0001032f.bin
2386ce29dc5c4e5daee201d11e0ea95055e3f1175c5d9df3444f74587c35449c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 17436 bytes
font_02_sfnt_off0001313a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1313A 16792 bytes