Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1499421bccebd4…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 02:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5598c261e0aa89d67a7f29199f41741 SHA-1: 3f900cdb0a02ebcbb380d61b784cbcff8d9fc762 SHA-256: 8a1499421bccebd4cbde786b53709f3df6ab6884d4ae057851a0c3206ce9a74e
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 phishing or trojan threat. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and embedded links strongly indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.cemeba.com/uploads/ckfinder/files/nugomegofukojovunezuxuv.pdf In PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/bimoredegowonavubeju.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/71799709920.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e84177e1---nowuteduxebufojo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef441cbf43---54870217719.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/91812843348.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ae0131801364c94aca0a4fb0466a0259/paluraputigupape.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/81703082797.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/tipazejofivefuvi.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/rufixetasekaf.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449faa73f85---14025150876.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/08dfd9d74644bd05b7a7d88e42d785ef/53717697139.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/15679217420.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210917_A70A6A1922DE8D56.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f26348496274964f6ead25ad465ff4fb/wosazomo.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/26202835289.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/52658062752.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109081802564485.pdfIn PDF document text
    • http://centronegozi.com/public/2481303217.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/12148858508.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/pakokanotinopupinojadaluj.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/titomo.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/degadusalumub.pdfIn PDF document text
    • http://vtaky.sk/media/file/47632828442.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/69223518442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=proguard+gradle+pluginPDF 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_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 18700 bytes
SHA-256: 5a2c3227b6b0e9d81efa17104a453cc7126936eabfcf05d4005a2e17f9800ddd
font_01_sfnt_off00011a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13295 10404 bytes
SHA-256: 2963f5c6fc70004ab3d24aa8868799a0c02fb5c6fe5689d8710de0acb0beb2af

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