Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d2768a9ceb467a…

MALICIOUS

PDF

137.9 KB Created: 2021-09-05 13:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2bb210c2e150d57ac88cfea87a13b71 SHA-1: 92ce662d94b049a8159f29a0722f545d3e64f8ef SHA-256: e3d2768a9ceb467adcc318abb34bb8b2d0e67f908cc29519247d115e71afc7c1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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://aawyx.com/sites/default/imageuser/file/xewinetixonuxukiwigesipu.pdf In PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f30088da---mevobeminodub.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16098701a59801---wiwup.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/44469051824.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/88240869086.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/85572735624.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/saxake.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/94907606661.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210628171223.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a463c3ec4---36588814135.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c8b4c645d---kenekixisasus.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/59704389445.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a55714b54---witudipib.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/39044480415.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/81p0h4la10gl0nqi6dtt8unnv5/16860743601.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/47312198e924753854bfd95dbc84cc44/ludofikigumopuv.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d74328660---53298310739.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/pilav.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/50371634387.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/gakudemesulikibikafem.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/2eccc68d0c5d4aff56fcde7bd4100ed1/77909713611.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c93901d9dafe16afae46e3a36ba27c20/26002008420.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/26846407291.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/032d9f0319bc71fcd7773f1238131457/93322128837.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9cd3b6339---vukukagobalufafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=john+stuart+mill+on+liberty+and+other+essays+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D003 18264 bytes
SHA-256: e6c8b70617e3a750f92d7e1207c3a4ed63f30fbb398476a9a8d847f6b3aeb4d7
font_02_sfnt_off0001ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF50 11108 bytes
SHA-256: e93153952302d4d6f872a01dd23c36500c7fbc1f0ae39f4af197d43c74bb3eec