Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fc968e865ae11d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 11:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: adba3924725ecb694dbb246af1212f76 SHA-1: 2a480fdd9cc77473ce16e6a9d36f26fe6ba5a2c6 SHA-256: 54fc968e865ae11d30d8e5601d105e8bf48d44c9a7023d9fedf5af705764d296
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination or to host a collection of malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=odibet+app+download+apk PDF link annotation
    • http://bbmeti.it/userfiles/files/jagatibipixuwidoni.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/24991460593.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/98152574072.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/28208087420.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd96533eb---20000238159.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff1de14beb---kufuluf.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f69e68d1a---75067580706.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/8611653712.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/23757663574.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/jogimumokevunukaf.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/tipuvowekexeponunipuse.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/91656276566.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e1925ca12---siwejusapetafevigizedeta.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132629a356b1---55019254549.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/kaxajotokijakijudeva.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/7825469103.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/78154484828.pdfIn PDF document text
    • http://www.polni.si/Images/files/virefetuwetegutunurubuj.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/jojetuzizaxelejujujizutej.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/gogogisalekod.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109041946247420.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139945b58da0---xapovozadebuz.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_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 10460 bytes
SHA-256: b264e68aa581d7e094c1ad5df5466ccef2f810119a01cad05c2a0b766cb49777
font_01_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 17716 bytes
SHA-256: 666ffe3239040b528ce22726d66e84cd7825ff0430ebb0bd2683612f8c2da34e
font_02_sfnt_off00011e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.