Malicious PDF — malware analysis report

Static analysis result for SHA-256 e623d9f75e3d1a37…

MALICIOUS

PDF

84.9 KB Created: 2021-06-25 17:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99cf7dcb7306c93c58ca3f7d8628a34e SHA-1: e5e7e0a7d62489c939c5e2bc65c602ec24904445 SHA-256: e623d9f75e3d1a373c9cf1e3233126fc57e01ce54dc98a716513b6df55ac3d83
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://accesoriosalmayor.com/images/userfiles/file/22632061812.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c193ae353cc---piligeduxosizijekuduxis.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/33ed86a88c51db05a342503b261eb95b/geraw.pdf
    • http://gapoom.com/upload/fckeditor/file/zudiwotukowowezegage.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/bf931ba6f5bd852ddf35e08030221776/modexevane.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e41da931f---51123960525.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a1bb98713---vegewuxoxegoziravun.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9609f85b---26723072972.pdf
    • http://haithuanphat.com/uploads/files/mifuti.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e57e176f---zuvawiret.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/bagum.pdf
    • http://3dprofi.net/images/uploads/file/runajilatodolozi.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c44c95ab0---diminod.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/gedakobalexivikesukeref.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6c08ef76554b8be6ceea050a1291d42b/tavotagakojitasuvimibe.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/8m6h1ogspubmj80plk9b7nesjn/komolodudonusegurof.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42460c0e5---53101888610.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16242276738225.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd28d0dcb0---xezisavewepokimep.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb3f85e2a---viwego.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/aaeu4r0321c2lssh493qmq6u9i/rabewirinibipumovobo.pdf
    • https://powermailer.in/userfiles/file/sudimaponifixikuwe.pdf
    • http://contelex.it/userfiles/files/30131302843.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=midas+touch+short+story
    • 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_off0000ead8.bin
708d13f0356acdc8e3c5c13e86f314c9acbf730e27e6a6120a65f5ff4a2e6ee6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 16800 bytes
font_01_sfnt_off0001166c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 16792 bytes
font_02_sfnt_off00012e83.bin
50aeec08841728c117e98dce6f2fda1f666d3aa6b601e7fd618a7281b175eda4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E83 10392 bytes