Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c0b6ea9386b9ab…

MALICIOUS

PDF

80.8 KB Created: 2021-06-10 04:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1828ca2fd9032e09703130e24153ddde SHA-1: d38e80e79de921ef5e3de2536507046bc06212c4 SHA-256: 08c0b6ea9386b9ab455769e43cbd750baa0361e9d170bdc03dd2248569153cae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is classified as malicious by ML and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised WordPress sites and disposable domains, likely to facilitate the download of further malicious content. The embedded URLs and the PDF's structure suggest an attempt to exploit user interest in software cracks to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=photoshop+elements+2021+crack
    • https://bursac.net/userfiles/file/podagagavovu.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c037091084e---dowor.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e9f238c57---11017035636.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/iqdmnu5s3s4rs36o885vhh72t2/javolaneliwutojufozowixiw.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/cb367f93bf15514a258929fb44e5c7ac/xikexevazimozulivezite.pdf
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/22884435583.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081b467de61f---tagedam.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/bv6il98ipitv5alq916umav3h6/67467732760.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/vddkkhmo2aiflnhlglca9f2p75/nijuvamaroxejemotonalusa.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/55d28a79724382bde99a13618b73e756/wudedefabediduniwa.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc3ec1bd6c---suvud.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/rexoxufi.pdf
    • http://www.abcklima.hu//data/editorfile/gipisijur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0000e907.bin
7570cc794ab37b310e0f9254df31b4e1fd4b9388ebe739306b6ae33521ab282d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 5564 bytes
font_01_sfnt_off0000fbce.bin
97bf57bbca376856939b7782d31290bad8ebbb4508793d7b03da4ecda678a336		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 11076 bytes
font_02_sfnt_off0001213a.bin
d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 16060 bytes

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