Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc3bee9fdcff280…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 01:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5cea10dfc17ece822b3d05df69f87564 SHA-1: af909e23fe51a81677e251bd687929825b005bce SHA-256: 2fc3bee9fdcff280b99192bca9f1d7045b6c73a821dd70c9721d25114fa64805
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://wastran.ru/uplcv?utm_term=how+to+find+total+screen+time+on+android PDF link annotation
    • http://clinicaveterinariabilancino.it/userfiles/files/84586287880.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210912_110153.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/vubuz.pdfIn PDF document text
    • http://abpaluso.com/upload/file/tekejenaworobi.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/25687726865.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/kumirogef.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/7264811932.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/88872639937.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/mubaboz.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c49b22eec---901934324.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/81592843990.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/biwezetavufaz.pdfIn PDF document text
    • http://adveotec.com/img/file/94921224813.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/797d6beeba9faaa4cdc56bde6523d602/58573348057.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/tewegifed.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/xukupebuferutanajipujo.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/22506952492.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090206483198.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/jateweridutotulamimelune.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7e479992---20829341489.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/36961696177.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/95886612746.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/93444413565.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_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 17720 bytes
SHA-256: 8c43db93880cbf9c62d39dfeec0096f2778ef7261f7b5913f6d8a09cab595c4f
font_01_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 10712 bytes
SHA-256: 2744a6dee5cedb37176201e3da1121c605f1b5145aefe09ea6d030dac9e5f601
font_02_sfnt_off00011edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1