Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddeec34f3923245b…

MALICIOUS

PDF

79.7 KB Created: 2021-10-10 03:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 98094d7ea36c653808d56463177bae6c SHA-1: 6d16e9678eddc4e999a98063a1d86ac235413e42 SHA-256: ddeec34f3923245b01d346db7afc2f21578eed713740994ae1bdf5392caa3162
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a likely phishing or malware distribution campaign. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised WordPress upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://badrivishal.com/media/kezejuwupopumewoxuwidib.pdf In PDF document text
    • https://austarpharma.austarchina.com/upload/files/tudilurorurozu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614071895e5c3---jevidowit.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210906152945-birerub.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/87627967171.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/99072635663.pdfIn PDF document text
    • https://matratva.in/userfiles/file/49527591826.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/82740379344.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/zefasijewipuveduj.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/zabofutejudogo.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/mejibalidam.pdfIn PDF document text
    • http://ministerium.pt/files/mukogixixuxifapanuvinifid.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/lugatiwarokabitipamefavo.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/puwija.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/370b4c8f63361f4a2e8c0fbb8e84ee99/83574370001.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/nekupusivetobu.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/potilojepoxizaxariw.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/50187055010.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/87668678944.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/48034281957.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161620df182278---89099508375.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/gapavuboroxegaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=radical+meaning+in+englishPDF 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_off0000cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDD 19768 bytes
SHA-256: 22a2bec28bcb2c4cf4de0f1f58dcc429797068154f8282e710e2adca0bcec798
font_01_sfnt_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 10544 bytes
SHA-256: fbebd861409d53e2ed6b4d98c5b828fb0c3b92b4c038307bea930f72cb32bcbc
font_02_sfnt_off000118e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1