Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d1bbf0dedee17c…

MALICIOUS

PDF

94.5 KB Created: 2021-09-04 07:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53d7dfb2684173284403af4027828c08 SHA-1: 7a74c64a130a95170e15e7d7135111fd227e46cd SHA-256: 48d1bbf0dedee17cefde9953539705201292d4de90005a6aa399e82eb1a47393
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The PDF contains numerous URLs, many of which are hosted on potentially compromised websites, likely serving as redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c645cd584b7---29165314248.pdf In PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/58e216c03bd575284b362da04689ff27/tubezaxitifogosixifitun.pdfIn PDF document text
    • http://e-hane.com/files/wifaxorelesulaf.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a42c0114103---19524361368.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/piwizazukepafujilimapev.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210622165907605.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/it1jgfmcsdhs303ti6uut8672d/dokagapiliratenexeriwan.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210531_D93A3F5539B613B0.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c511a54aea0---64054915475.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/29579850850.pdfIn PDF document text
    • http://thegioinoithatcamranh.com/media/ftp/file/91127311753.pdfIn PDF document text
    • https://mollis.rs/files/6398257077.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b66d79d6f9---67649825772.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210625182703.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/sonexomutam.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/paxutexari.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/vupevupuxepusaw.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/tekafumowosifatumi.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/hmr962vjb5v9dqbq4temj9ovlh/mufadiponiwuxas.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4b4287f4---zexejifegor.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/vefavarevinufese.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333ab43561---xelumizotabowutuwofez.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/8352313491.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da549f2e0f3---virumerili.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e489a45ba15e71b9674b74d5c82fe63c/64233512976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ave+maria+schubert+piano+violin+pdfPDF 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_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 11172 bytes
SHA-256: b0e255e025f484c8274fcdec4858b39d11c623948e6f6f709cf941fb2db4f421
font_01_sfnt_off00011dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 20596 bytes
SHA-256: 3d67d18dc595aaaaa4e7ce76d2d26c25fa2f65c32f0db6cf2d71ee60d7913da8
font_02_sfnt_off000153bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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