Malicious PDF — malware analysis report

Static analysis result for SHA-256 4982d33e3a33cc3e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 22:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6690bd64ef48b510e7dc8989c52bcc03 SHA-1: 0e9019a48ff9b5ceccb11ef1733617d97e92120f SHA-256: 4982d33e3a33cc3ecb96bd44897347caa59197859c83e2f4f2508799816d165f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of link farm heuristics and external URI firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lumieretvie.com/userfiles/file/84408250317.pdf In PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/11179302021.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/vamoxatazijilem.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/2266710497.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-11/images/files/bizevowilowopirebeja.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a0aad18c4a17cbfad03a363b1f3a42b6/kawalitixatanovexobeli.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161315ca71d242---pilekuboz.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/5261565513.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/6837223386.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/9045315772.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guzedotuwugabeb.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/zuwadevadunepexezijoja.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/kemifikinolurebufe.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///30331651144.pdfIn PDF document text
    • http://apple888.vn/luutru/files/31949357341.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf13baf23---16929435624.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/54687696503.pdfIn PDF document text
    • http://getem.pl/files/file/63808733508.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/rukujetep.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/97379653104.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/wifaxavuxu.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/febaradudajedabe.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/laganufuvotimizurozuw.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/wosipugumus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+move+photos+to+internal+storagePDF 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_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 10844 bytes
SHA-256: 5353de24c0ddb5e10e3ea3c36eba5a143e2d48da1cfc9b3c702921544b48f628
font_02_sfnt_off00011604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 18816 bytes
SHA-256: bb5ad971bfb0a70a24242e372e14aa5f88d465fb4dbd94d128493a644379299f