Malicious PDF — malware analysis report

Static analysis result for SHA-256 830b9e19f9899505…

MALICIOUS

PDF

84.5 KB Created: 2021-09-12 23:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 563e905238f6d8b500d375240a567008 SHA-1: 8fbdc68279d56db6f9b1fdc404b6fd53b9f84758 SHA-256: 830b9e19f989950521a1277aebfc3ef0d6a4b337239c2adcd3a0bfdd6e2d05e2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Security Software Installation

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links pointing to potentially compromised WordPress sites and the explicit instruction to disable security software strongly indicate a malicious intent to distribute further malware or conduct phishing. While no scripts were directly extracted, the overall structure and heuristic firings suggest it's designed to exploit user trust and bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161315b2fa40f1---63045571451.pdf In PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/95876979690.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/tivitor.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/27957856196.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/pelanoz.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/32371953789.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-10/20210910183210336219.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/semusumuxevaluw.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/mazefowas.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/68055776403.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/69726276999.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/wolekivugujebikusawoga.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/31489349180.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/57706484898.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/gunemumisu.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/43261999357.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/21986377248.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/13727188205.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/45829132765.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/6110367936130697da49ab.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lfvfqofqe9fcgb0daa3hhevo33/13469691000.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/37892456360.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613369fa70dc3---boxurasovujujunanez.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf74cb397---21086270629.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/31121731240.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/jovisusiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+walking+dead+season+two+torrentPDF 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_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 10668 bytes
SHA-256: 8a2b2fe72543c1fa263c65d950f9d864d72e7f19e51a41dbf185a71f1410acc2
font_02_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 18720 bytes
SHA-256: 6fa3a29e9d717c20e8608c4ec923d61bfdd384d353c3f8e1f8f544c134e4424d

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