Malicious PDF — malware analysis report

Static analysis result for SHA-256 707e9a4dbe1dfbd2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 22:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: feae43d771bf49860e07033faa92f019 SHA-1: 145dbd3726d086ddc22113471e188cab95989efd SHA-256: 707e9a4dbe1dfbd2ffd9af1d3d45df76bf5aa4ffcb92e8f92041ed3d79760097
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The heuristics indicate the PDF is designed as a link farm on disposable hosting, likely to obscure the ultimate destination of the malicious content.

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://infrive.ru/uplcv?utm_term=difusionismo+antropologico+pdf PDF link annotation
    • http://maslag.eu/userfiles/file/damedup.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/90aee1051a008eb95f8c6e0f370fa34b/85831499573.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/6965224000.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/25862351051.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/25651388109.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/20957808000.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210813074546.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/81888296632.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607183152be92---gesasosapuw.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/gowotap.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/87808927671.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e898537a33---taxokodidaperojom.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/245da5f28d5281a98f6c89c7f9222173/96639734159.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/sesimikimafelalabuvugesow.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jufabiwetekitin.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/41171961471.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/61645439117.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/lezozevipifib.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/12889877740.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4c310fe848f7637f8c90eeb4964bbcfd/11987686743.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/vemexagupazedut.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/fe2ce5dg1d02bf6e7al2k27ifo/jenunasazonajik.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_off0000de45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 19124 bytes
SHA-256: 4dfe3a2c98b3e0a1fbea90fc44117c7916038aaf54bece20aa0171b407724fae
font_02_sfnt_off0001283c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 10932 bytes
SHA-256: 0720b315b5fdd9bcdfe297ce96c7b0246ab10dac2fd89363312bd8dff6f9ebdb

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