Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0e823cf4d46a8b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 13:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 204800c68f76cd2651aa32a9806b5b01 SHA-1: 6c1c843ad0a9c08d9b17001102d0c6c09a037d5d SHA-256: bb0e823cf4d46a8b35a12d523bd8c90df6b572dd48547802b6f75125f304f676
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links for malicious purposes, likely to distribute phishing content or download further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=among+us+game+online+play+now PDF link annotation
    • http://clinicaveterinariasangiacomo.it/userfiles/files/89081832273.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/gatokufi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614377862edf3---senanif.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/78068107300.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/jepazinoma.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/jorumawawemixana.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/42573000716.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/befetufavifilaxa.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/saxukoxaviji.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/laxuvafalofetek.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/tokufogilobisixuwuworejok.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed42e900f---zesusonawedesunojolav.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/bigixepafipibabojelu.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/dovunesujepewupopu.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/64682291406.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/a78og3puo2jbalhik7gcpdt4tq/zewuzoxetaxobarib.pdfIn PDF document text
    • http://maconlux.lu/userfiles/files/mesijudipogobi.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/68295565504.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/61492261468.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/76706643255.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7363a6e29---libufora.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/86681269353.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/71474744407.pdfIn PDF document text
    • 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_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 10680 bytes
SHA-256: 8278d9033a2f4e5ce9443dffd02ff14e16a99b82f2d64cbc60f12b1d89082e2a
font_01_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10933 18056 bytes
SHA-256: 031b45ad1c33e9b92a23a09922a5476ad89aa71421d6fb7f79866febd4849f7d

Open this report in the interactive analyzer, or submit your own file for analysis.