Malicious PDF — malware analysis report

Static analysis result for SHA-256 a371bb7460a7ffc9…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 10:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 054967920769d4a6f8e94ddf912f0eda SHA-1: ea047f5d20f86e0c0788fcfd28f994abf6c14bc9 SHA-256: a371bb7460a7ffc9a91bf626f31c7306d42a29534611ff3d2de51691ee7400c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jss-moms.si/upload/File/96125270690.pdf In PDF document text
    • http://potlista.com/file/files/kaxit.pdfIn PDF document text
    • http://keramann.ru/uploads/files/zibobisalopevegujomuwizo.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109100845594555.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/xezal.pdfIn PDF document text
    • http://agilesolutions.in/uploads/sijukeso.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/1330139196.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/17318649355.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/41232186137.pdfIn PDF document text
    • https://hssanesteban.cl/files/joxosugefewek.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/pofumumuxibo.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/27394346031.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/31462943196.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8780076c2---18649223659.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed5cb9ecd---54927882006.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/nitagufukipamit.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/vipekebabomasaziwaf.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/xukipukugudomuxuko.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/lagulokan.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/sabusurotomolixavot.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/70474559003.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be844e94e9---93045460957.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/45452275411.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c273d9370---buxilizonokajivojisole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mobile+screen+mirroring+with+laptopPDF 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_off0000d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 17804 bytes
SHA-256: 1403d392f0a6b11c200a6b7411bcf729ab84cf239d6d6e18e7bfadb6b22421c8
font_01_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 11040 bytes
SHA-256: c2d62a3fff46c77674847dea77e4e0dc383c9f04450c3dab5c3298d022db9184