Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97ea1bb1225c9f7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 00:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc6f811784f6cd23f08add7de46c8893 SHA-1: 74224db896f259cb61d5e37741e59a43dd12bd1d SHA-256: f97ea1bb1225c9f7f0b8c27e2d64ac85250c27b87ac8fb2bff36430f23094ee1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://open.ua/uploads/ckeditor/files/26261872865.pdf In PDF document text
    • https://kalimati.in/userfiles/file/77409974358.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109010657014726.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/98056751777.pdfIn PDF document text
    • http://asqcert.net/files/files/18562943265.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/wijopebibu.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210907131947_692eej.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/zewirifegigefele.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/86795898242.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/zodimigil.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/58166139950.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/tobifesumoniroxali.pdfIn PDF document text
    • http://kaies.net/upfiles/210909051356426646w6mf1g.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343fd50e986---13541406273.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/46398131192.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210904065441.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/nuzifidetoxedapenok.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/427198ceef141b27896decdd66e055bb/rerokabojupawefi.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/1669199389.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130868eb50fb---xinonasuzejobinur.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/guterufajejaxa.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132468f0fc31---tuzikoromavazodetore.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/kelovoraxigagitugetur.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/puxisemugasam.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/jofoluwimalesovavijexosix.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/pojekupufakijinobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=magic+piano+apk+free+downloadPDF 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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 10700 bytes
SHA-256: 4a4a904cb98cdffed118e090ba97b8e9ea86b4e883abcc54024f1322a3cc0c06
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 18384 bytes
SHA-256: 182e3aa6383d052dfc5b1a40bf243d74b33df5c2f956f2dd31b5cd61a9ddc994
font_02_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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