Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae722df393a8496…

MALICIOUS

PDF

73.2 KB Created: 2021-07-01 11:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2417be391a6fe4d43c195536d93a3b4 SHA-1: b58d4ed5cc2506dbfce6dcb7393ae24e867014af SHA-256: 5ae722df393a84968a3f1015a52adb15357ec0b0e192cb663d53b151609cc1df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This behavior is characteristic of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/3a8e29d2d3999817f7dafa15d0496a42/95520836677.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9241d407---60318383872.pdf
    • http://rkmaster.ru/uploads/files/28254642958.pdf
    • http://sistersaviopublicschool.com/userfiles/file/92611146130.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/slhbet5jjrmu10metfn9arcblp/vujabubimajomuzadexovo.pdf
    • https://bbgpiti.com/userfiles/files/78309182437.pdf
    • http://bjaimama.com/data/upload/2021/05/file/202105151024174392.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/un91tsbehsgaufojhl04a3lp61/somasojanabigad.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160994259548c2---6663785991.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609df4d889b83---91891203092.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afefdcd5d---rapijutamenufogamisi.pdf
    • https://armagedonspedycja.pl/files/file/zimuvozen.pdf
    • https://aldurra.ly/images-editeur/img/file/bugugo.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0d36df45f---wulanerazuv.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/2eb46c50ddc8840380f0b4ee8e538b59/35657451200.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/tuwugukinijozagijimukik.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd70d14a41c---vopebugaduzatogogelo.pdf
    • http://astro2sphere.com/admin/images/file/binisetufumajuramuv.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/gl8i2g3sh07h24su0j6fegrsnh/71061487962.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dff07323c---modav.pdf
    • https://cargotavio.ru/files/file/kovogatinexotaferif.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/vlhm0tdghib39629ob6lpudtd0/rufibo.pdf
    • http://tgtech-auto.com/userfiles/file/52036189279.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=accounting+4+everything
    • 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_off0000bee5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE5 16792 bytes
font_01_sfnt_off0000d6f7.bin
4c54766c50691945594da8e402e568f7760adf71ce547960debfa161e454c2d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 16156 bytes
font_02_sfnt_off00010005.bin
c76701910c872fc5cfdc9ed47d8ce8214ff0432b4d64ff287a9ea8277533c111
pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 10472 bytes