Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe4a35c0fab59c4…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 14:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8b8070eb6f2576dc419cebccc968b941 SHA-1: 95c3df81ade829afd085daa00bd8b8455ededda7 SHA-256: cbe4a35c0fab59c4a562d5ceaadc84cfa097f78b8668b0c6b1039b8d0de44ed9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of multiple external URIs and the nature of the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423ce7b794f---28903202602.pdf In PDF document text
    • http://baominhlabors.com/upload/files/butipoja.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/retigosogedodi.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/wivoxikejufozogowefiw.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/18519082907.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/3418097521.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/viwedesululebowopenofof.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/fenij.pdfIn PDF document text
    • https://botroul.be/uploads/68117603792.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/16300854322.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161499dd55c4f3---woverewexebaxixa.pdfIn PDF document text
    • https://granitnet.hu/editor_up/16090443255.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161417a1a1c61b---69699628072.pdfIn PDF document text
    • https://nppmaudaha.in/ckfinder/userfiles/files/88282194095.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/8999322335.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493e38db172---77625904817.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/vubevip.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/xaroviban.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/wigojixeziruk.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/zepiguloju.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/88810168297.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210923_CDD4EF09FEACBA22.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/jezisotipu.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/vobezibavagak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=disable+background+data+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_off0000b078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88A 16300 bytes
SHA-256: 99e9167cf88a5aacaf93c3fa4c2bb0b664c8807e42f29b0634279232e7d43215
font_02_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 10880 bytes
SHA-256: 0c675d74ad3c1b89f48c3303f6dd43ccdedf411f41096ab61f4cc7b9f0414a0d