Malicious PDF — malware analysis report

Static analysis result for SHA-256 96893355b3c8516e…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 16:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9f92b4bac5449a3cb92412afa02e5ee SHA-1: 5ef45c0fb1850e711257b106cfdb6aa4983a93b3 SHA-256: 96893355b3c8516e8d3f62b26ec67cae377945e64c20cbb0f3156413f3c1326e
176 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings suggest a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://appinaris.net/ckfinder/userfiles/publics/files/lemaxoxonozogevetisero.pdf In PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/kikutew.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/nafakufobabimewutimeroki.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/mixozowapo.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/24818291389.pdfIn PDF document text
    • http://erictex.com/ufiles/files/87721459723.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210902101105.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140106446931---gokikidawopotajixa.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/xizisu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/cl4lk835etgr0qsfmgcrq1tlno/befafekep.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/banikumopuremujiguxusa.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7d4f2e1c8---27601580152.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/50636084624.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f915bab36d---90707405512.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/zevadovepasizonutarowexas.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613af4c833f1e---39134512256.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16135d28ca33a0---24267886178.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/bufilatilefola.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/22506760595.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/wotupotawisabebizagutus.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/62197989177.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/bidogodafo.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/99882338359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cars+and+guns+androidPDF 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_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 10280 bytes
SHA-256: db60e8016c504aa0d0688de2e782734a9dfcb5fc071eb689305f0e45660f42f8
font_01_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 17608 bytes
SHA-256: 1cdd3fb7299c5ecd785794ec2a85c244ce4646c4fdacb13558e14982445b9adc
font_02_sfnt_off00012db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1