Malicious PDF — malware analysis report

Static analysis result for SHA-256 757d179c6ad25523…

MALICIOUS

PDF

72.1 KB Created: 2021-09-29 07:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 67a1abbe5d872590e2e8863be1e75c31 SHA-1: 55cc30f5c831787daf2a0b07d201815bdea62cd3 SHA-256: 757d179c6ad25523639f433f645b24e9c4a5334103f0e7b8c25fa49c2a667650
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to external sites for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a21bb4b115---40072219977.pdf In PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/revodiligegib.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/it2k3uef5lglq2sb2f2es0cqch/77777310178.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/37114444202.pdfIn PDF document text
    • http://sswjeans.com/files/47853119342.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/59622934654.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/44993049722.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/58624924083.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/20972380546.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/10479111093.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109182110547856.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/nolun.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e5fb2f057---vulukebaledojubewakesozi.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/perovir.pdfIn PDF document text
    • https://parkettworld.com/upload/files/47718677459.pdfIn PDF document text
    • http://spharma.ua/files/file/ruvelajozufivabetisofaxob.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/57812917391.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/wiwesopozoguma.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/wojovusavufivalob.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/pimuroxemilogubadonog.pdfIn PDF document text
    • https://mayxaydungdailong.com/media/ftp/file/kazunimoletewonufujek.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/wemopiwavazat.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/21b5e3qcitpj0ugad5poqt3kh7/rokixutudazef.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/zisoroweto.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/62194406072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=video+editor+app+without+watermark+apkPDF 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_off0000b697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAE 10588 bytes
SHA-256: 0fecce22da1f229cce96705856afa0ca5f88c710a86ad57cd78c0fcc0e5f2946
font_02_sfnt_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 16600 bytes
SHA-256: b488c455efa3c65b8a7a6e551ef942907c46b6f4ce22cc2c4fb9472123944aae