Malicious PDF — malware analysis report

Static analysis result for SHA-256 260455ebe1041921…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 06:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9332db1832b09b252d45a541fea302f0 SHA-1: eded3f53280a26dc68b66beb0742f849681d5ac8 SHA-256: 260455ebe10419213574f8e5080445610c31d71b2548c4f13da1d68a815526d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b9c31aad0499c112a8aa679c823922fd/25528807042.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4e6ba9cc9---77892639335.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75255a830b---37215753667.pdf
    • http://goldmustang.com/files/files/84157900586.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160846979e1280---63787599078.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec13782cf---1025651134.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/84133471775.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa1f55680ccc32fe802c7b0f0878c8b4/pesogekap.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/09baafba002d977d69c2e990b661cafb/kosizijojumujivolajawanos.pdf
    • http://trendymamy.pl/userfiles/file/71219419553.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/9c7db391fc4b1e115b71bea009b438c6/7086963487.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/2c0190a768339fd4f991df4a9ab70068/menupejoxesa.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e9fc8ca775df32d62aaa086aaa565b5c/84634265600.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c472d1bc---ludunubimifanixalival.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca580d8dc8---58798024267.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a42ca123c19---sujetujofobu.pdf
    • http://www.hydro-tg.pro/upload/file/xokutov.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba6696028d---lutalanefiluwemevubamim.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bcea907f0---gogojezugadof.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6f10052cacda5961c70681cf7792e74f/30970087338.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6040cfc48---65491518262.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609666cc29bee---fununifekurepemisex.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gucci+mane+haunted+house
    • 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_off0000edf5.bin
b3e16911cbb1ec9de6d114a89f0316a47640d407dc4661333750e969fefa5f16
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 10628 bytes
font_01_sfnt_off0001061d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 16792 bytes
font_02_sfnt_off00011e2f.bin
e8c1cd55ee3cb4351b7ba842230a3363d361d4a1a110b33a468ef9249b4ae2b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 18236 bytes