Malicious PDF — malware analysis report

Static analysis result for SHA-256 734b5c5e19b1092a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 14:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c58c8cc657f25eb73e3a73cf839a6413 SHA-1: 2cca11af239f6339e803c2c798514a3e5c3b4cbc SHA-256: 734b5c5e19b1092abd77b2d379692dd50dfa8ed116697e081bb8ce4f79490c81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and URLs point to a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612382036777e---maropubapowojuwem.pdf In PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/45097980842.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/43366807311.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3af7ac08f2e4e513c056047097205c55/49197213087.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/adr3ddmfo0c3dmubu3tqkouhos/jalibapolamadekinarum.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a533f2b51a6046a7c0672b2487dfcd2/bikemap.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j6bc2p4adaaafmsoupd67vr133/fagimabusigekipoturom.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/48167223669.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/beturotezufefesetixipewu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3e3424bd985f1b8403ba27ebe7277701/riluwedenodisufu.pdfIn PDF document text
    • https://digireg.se/upload/sizigetikatojev.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/janofamenimezebewadas.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc19c8b890---fugikujonimapijonigasodu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093f701dd09f---86630898266.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/xolazebizokiko.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/96265387204.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/6511489877.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/apql2dv6kf2fahagjtj41r6np7/57167939999.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/najeludiz.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/52899987214.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/20602766231.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/6b75cd9f9d9fed96d4b6d0afc8673543/wolototoronexuzadaziloxe.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/58807378057.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/14396528557.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161255c41b3d09---delusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=articles+worksheet+class+2PDF 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_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 10504 bytes
SHA-256: b97f55473ef6b3b3816f60ecbd0d8d611365b57033997e7ac6dc108bf46cda55
font_02_sfnt_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 18256 bytes
SHA-256: 51c1a26797975830ede3de4af18fd8f8a6504901d9d405e4b131422d8aaaa603