Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8cde220fe6f9fe…

MALICIOUS

PDF

92.2 KB Created: 2021-07-31 14:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 922695328f27b389c0d96c32c92056c4 SHA-1: 519c16ad8ab07f31ef8f59e0c7f10c90a644d9a3 SHA-256: ca8cde220fe6f9fe8edee9f776a54ba077b274a1a7cb500992e696887c30526d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bjsprt.com/uploadfile/file///2021051301034345.pdf In PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b785613d010---81520444965.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b16f145191c---83012307514.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/bfb8b3efd65193ffbda84b035551471a/zamupunazotowe.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/turegefep.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/38823615654.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609676116dbad---45367073013.pdfIn PDF document text
    • https://0900107678.com/upload/file/17659583875.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/12951608661.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/084749271c7673ff7647e2c19b833e1e/72412413723.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/pujulijoxizibifakepodi.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/61669040217.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/werereninokalilusaxu.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/25370542439.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0905ed3c84---tamabadorofijezubutajol.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ddb1ebddad6d209e998af6800ac17be5/wividuvaxutegojejige.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/32416442585.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/nibaxipazakak.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/4041474451.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/mexag.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/19061893739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=alexis+kagame+la+philosophie+bantu+compar%C3%A9e+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/45b6700192b2c28f2f6443bef4c8a8cf/14895877949.pdfIn PDF document text
    • 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_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 11636 bytes
SHA-256: 6c1b6362175af53a00af7b4515c23180878cd40ae77d8e32fced5e291f2654ff
font_01_sfnt_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 19932 bytes
SHA-256: 73104e0dc9572aed49f09856a4a9926c5213905f67b95554452d6143d343753f
font_02_sfnt_off000147bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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