Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dbb129aa3d3a60…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 03:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 98d05515bc536b551bcce27da12dd189 SHA-1: 9ae35ffde96d1ef5df24c56ad752100027728032 SHA-256: c5dbb129aa3d3a60ddf5d84ddf843c8c696546b353356d91cab36d1080172874
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites or disposable domains. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities, while the link farm aims to obscure the final destination and increase the chances of a successful phishing attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://ambcavallon.eu/userfiles/files/lufipinimovunoza.pdf In PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/569660470.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/44757061441.pdfIn PDF document text
    • http://ave-france.com/pics/files/fijeniwasunejad.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135a624cf89a---9296039862.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/zosilusokinepomakoga.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/17316836555.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ed49f3db7f70de11a355ae7e9f5f37b6/16623847820.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/53603828324.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/22090870920.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/65330139836.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/lilagajupaxidikupefifora.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9fvdot22uqce9j5l5pg4vblus/58705744781.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021911222439.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/39042883089.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/62838385375.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/23718345474.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/woxig.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/24983181268.pdfIn PDF document text
    • https://yellowstonewildlife.com/bomotipubefipotodu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1d4a2e883---12947154626.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/poxerawuvofapi.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/neteraguxege.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae0fc0c9be---tupafebifufawuxiveb.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/vetobixikukekes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fifa+mobile+2020+download+apkPDF 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_off0000c9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 10832 bytes
SHA-256: c6a4deda0a8c23d6b5fc8a5466516968a91b5251f21817b5f53bd61243067a9c
font_01_sfnt_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 17588 bytes
SHA-256: 840d2c7cd5f83afcee7ece854c3456b291c5660d56d210e2a0ac49a79818f804