Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d7722aef275d93…

MALICIOUS

PDF

79.6 KB Created: 2021-10-07 16:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 52fcaf30c797ee5e8c96dc8ad9d54999 SHA-1: 29a1cbba9af2019a1e68d95757e6a19c5f639dec SHA-256: 77d7722aef275d938cabae5a38745da0c871a344511c7b6b752a59939fe5f83c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute further malicious content or phish for information. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://centromp.it/userfiles/files/45491628916.pdf In PDF document text
    • https://charming-dc.com/uploads/files/202110061945206550.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/setogamapojefopexama.pdfIn PDF document text
    • https://irrisyst.eu/files/file/reralokavu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615641702f27e---xuwuxeremux.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/6166710388.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/jawimegitil.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/28571755185.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/pekosoj.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/13291235243.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631010825razurunevi.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/46774504267.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/98658848731.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/bubox.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/78938903542.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1f57667c---senomerobimikiw.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/14382431568.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16150f4f7abcd6---mudixakegutukanofenuwuj.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xadanu.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/61123051263.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/455737781.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/mamubedubirafelamuwifidos.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/28673578034.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7588ad9ab1c77243e1963fb93bb75e96/18001544009.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141f2e303f23---66933997521.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/37213701233.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/zepufidadoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=income+statement+analysis+ratiosPDF 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_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 10456 bytes
SHA-256: d8921f7a85cc900229ad0b4a36bb72adfff83d87f05e5c58fea8b484690b2920
font_02_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 17012 bytes
SHA-256: fbde300ea01c216e91216846646348acf1efff847e71a3ed170cf4501d2863dc