Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b74cc2010c7dbf…

MALICIOUS

PDF

80.8 KB Created: 2021-06-27 01:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d9628c78411af0cc391ec6725a3d35c SHA-1: 94d1ff8101fa72ed582f49170c9eed7bdcf055f0 SHA-256: 21b74cc2010c7dbf96e06261052a6f18a32f202d48446efcb26ea95fe610d8b3
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=not+tangible+meaning
    • http://driscollandgibson.com/images/edit_images/file/60298595735.pdf
    • http://consulcongress.it/uploads/assets/file/lulokivamijol.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef7ba2402e---44688513138.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e3a03ce09c864717e01716e905842102/nosowitatadosa.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/885f1901cd14d0e08a21fad38fb87141/95470608587.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5e6c7dd4---tavukodasituxapag.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ad6572136a4017dd3e5f06fc0298ea0f/63723481507.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/162362260705.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/fbc1598fea9aaf310ee362ba1e0115ee/wisavusojuxopikeda.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a6eabf35b---zujusowi.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/79o8s4g1jdifsmhm8b17ka6epp/37957293680.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3heqri3levlu71p9juotg8rnr4/82185677023.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ca6bdb9c2---64887672108.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b00100e1e---nipalo.pdf
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/dineledesekadojo.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/kekaramogigogado.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b034b41ff2---nosakixibegexugaxiduge.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/og8oe6kld6mmtcti518pjdre0q/roteve.pdf
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/78110959110.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9feefa85a7---3359420796.pdf
    • https://aterhesseg.com/up_image/file/58198837441.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8709f0c6aa06ddc7a06af0b5576e1ded/gabusunovetimolimozosizi.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/golasqkbipdf5j7n3u1h1iqou0/48733293663.pdf
    • 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_off0000d898.bin
2ef6122d18a6af2916bac863b2af970ecbca746260a508ecb70f3bfcbb93de00
pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 17652 bytes
font_01_sfnt_off000106f0.bin
0df796f2088f187a9286016b186ff5b292d36345801af580add363e8c27dffdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 10300 bytes
font_02_sfnt_off00011e21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E21 16792 bytes