Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71cd604f6ee7f0e…

MALICIOUS

PDF

88.9 KB Created: 2021-07-01 18:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24a92b7f8567a95a160b6a5ca0f25f41 SHA-1: bf57efa3d8670bec330cbdb8f357322f2ca6f7cc SHA-256: e71cd604f6ee7f0eff5c0f1ce0d6e9ffde6673859127c48ed7b2d85eeffd4a30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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 https://philabc.ru/uplcv?utm_term=chi+square+likert+scale
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/278cf103c0fdbb641d5c09b83161ed60/38846644205.pdf
    • http://www.ecostroyservis.ru/File/37742917519.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85a99225c---roxeli.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62be3b3432---wibenuxeviladidife.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bef2b034b5b---98860762267.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a71a2caa37f---45491620512.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b152f0316838850e0417143a2232fb23/todatukezogisatoxenawexen.pdf
    • http://appartenvue.net/appart/upload/images/robakevek.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073672d09bcc---powaxupodi.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/0lhsuqbauo43u46jpt9kkofqbu/44064441062.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/u7qbl1vqbajj7stha73u101ot9/zugilijonatasitimesegojuj.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/werudidaporakoxo.pdf
    • https://webmenuplus.com/images/file/gafilifu.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/834a0a173ac424ed954ac20fc7f842d5/sabokumumevefig.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7f5e10201---98573829049.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/48dbk45gkjcvgq6p02aktg9hm1/98429187988.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c5764d5a7---zabituponatofana.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/61696557445.pdf
    • http://www.klimavill.com//data/editorfile/59908774322.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b83cbaab35bc00c8c04265b68864f91a/92127560056.pdf
    • http://annandale1963.com/clients/69704/File/mebufatore.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83719237b3---39481088908.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f3e618c1f92dd9df00d075be1c90ebd8/voxukatomezagemozini.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0bb014c0f235355047508f2e5f57bf35/52385474656.pdf
    • http://auxerretv.com/content/public/file/zesutalovoj.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b965cd98b002707d0b2e994556645be1/liraguzolotesana.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_off0000f70d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 16792 bytes
font_01_sfnt_off00010f1f.bin
2928d23a4f2931fb22b098f1c41dcde8c21d68647f4b25cbee225fc3995911c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1F 17940 bytes
font_02_sfnt_off00013e84.bin
1869f9b885370073cf7098976dd6a7290421189b9bb7ae950a3356628b5f5ad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E84 10472 bytes

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