Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a7a5e952e4153a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-14 00:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0218b27b9ef4bfeaf6feac7d43e9754 SHA-1: 7d92a901c736545fcd7fafd1c95c98b841bce341 SHA-256: e3a7a5e952e4153a37e4a84c4cf5e20d0a13f81da1c5566b0457e61dafd5cd1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL targets indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://5thaveseniors.org/userfiles/file/70741073127.pdf In PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/17953394248.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109132307204167.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/komuwirigojolixesemaf.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/venegega.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/mutelimofadesalipanu.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/lulap.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/vufesixibedojalexo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dixojejumipan.pdfIn PDF document text
    • http://timocomputer.cz/files/file/bovasowiloko.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/86758140981.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/xomariladejikobaw.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/bebidigow.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/mipomulezepotawujal.pdfIn PDF document text
    • http://gardatrans.com/content/Files/xugezijulo.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/fimafat.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcf5988d4---45866831479.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/70665855046.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/rapopaboxapa.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/24385664163.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130af71506f6---vizazewidezabokag.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1e4a82efa---91992194303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+impossible+quiz+unblocked+gamesPDF 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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 11264 bytes
SHA-256: db1f1a039b794a1c897e3aabe42dd618b2c517e29a3a65092b6ddb5580ba34a3
font_02_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 17616 bytes
SHA-256: dceef6dfe876bebcdf03e5c8a11fa87ec40cfc6c1fd9a9c02e79b9f72ecabc2b