Malicious PDF — malware analysis report

Static analysis result for SHA-256 52080e2b56d84697…

MALICIOUS

PDF

71.2 KB Created: 2021-10-07 08:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c836258498efa876a3af40c25f42385f SHA-1: 2175319250dc5c4499c63a110b42d43fe1c0c259 SHA-256: 52080e2b56d84697e1643c91dd06f1286e25683e8e42c033f970813506f93947
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allseasonsart.com/uploads/fck_uploads/file/biwagen.pdf In PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/sfl8l67buldtcradhqmi2gno00/32457521442.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090414163873499.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/kuwelinawewukekoje.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/9051177397.pdfIn PDF document text
    • https://patc.fr/imagesfile/sitikukexoz.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/suruverimejajal.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109151921489171.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/51536878674.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/xalegebimenenipurivadera.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/37039513888.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/27206988475.pdfIn PDF document text
    • http://imaginove.eu/data/Files/tijuxugoxojiseguk.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615774fc9cd7e---79787723506.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/pojesa.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/nolenenukimulixurasal.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-10-7/20211007050704788664.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/tegitofexuliwaki.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/22985524154.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/55903142079.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3c5252d4e---20191662317.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ab5791db---mokobutuxugozox.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/30418355236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=economic+globalization+examplesPDF 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_off0000b657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB657 10904 bytes
SHA-256: 260bcff8920a3076a640810e02a299114b17780be883a019a30ebd47322f71d0
font_01_sfnt_off0000cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 15696 bytes
SHA-256: d6565365b0dda3f3c0f2f759691462715c4819563399ba2510ba36341f5cb545