Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c32b77bf1d0f6bf…

MALICIOUS

PDF

79.3 KB Created: 2021-08-26 12:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18ce75ba288dc1a263605cafc6c0ed35 SHA-1: 830670abce7e4d6e1514dcedaf969f9ffdbe3353 SHA-256: 1c32b77bf1d0f6bf582363a55bfccb507a23433c8ed246a02bbb4e8a6f48e4e9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cae93bdaf95a0ee688edaef2c26ac8a9/budidokevubojeken.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611bdd637283c---55721102446.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160add34ae5600---ruvotun.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hinmss427cp8ha83mlbo9ers5u/janomawugunofobubu.pdf
    • http://occahomesearch.com/userfiles/files/23959092879.pdf
    • http://ultraljud.nu/bild/files/kemale.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/da71172785ac50c5db66c1949fed5651/sugeviduxanuvasaw.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bae7e1801b1---79263977104.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/cdefe8e243d796402882a20b5293a656/jivonivikupini.pdf
    • https://rubenferro.com/userfiles/file/ridexazuz.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7c8db1b5d---15558140832.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf3f834e18---38365420293.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/repofetevobisav.pdf
    • http://gamebonda.com/ckupload/files/rifafoneloboso.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9344a532a1---30625129925.pdf
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/dazorigunomukogufetul.pdf
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/gikibojibifetipi.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34e882911---waronavisivigeta.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/652e4831ebfd0e19d4c920842f14ec8f/96095914162.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb602b5158---66066030503.pdf
    • https://vandolderskb.com/images/usr/87154874302.pdf
    • http://anhbanglaw.com/userfiles/file/24945610216.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d801f35fe05b06f56aa9460510dde4f0/fotumusedoten.pdf
    • https://cargotavio.ru/files/file/40668399725.pdf
    • http://chickendaylacrescenta.com/uploads/files/24952307975.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd27a6bd2c---95039539053.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcd97c8b60---76486049872.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=control+system+design+goodwin+solution+manual
    • 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_off0000cfe3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 16792 bytes
font_01_sfnt_off0000e7f5.bin
9e35598c19e89e9ca68b9ade99a201de5ac56b4bdac8972c57466a706a898b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 17400 bytes
font_02_sfnt_off000115ce.bin
30f2ee6c017b8e376cc85c1dcb10cf7388ff12bd9267542366c1d708976f355d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 10924 bytes

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