Malicious PDF — malware analysis report

Static analysis result for SHA-256 8111efc0bf64e76a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 03:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38dbfd0cecef66d8f561355422ee5824 SHA-1: bbd4bee184d1c5ee1f277005b232a095037d6c55 SHA-256: 8111efc0bf64e76ac742ece07fe60e8e28bcf314015525351939d9d9a6e5ee4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting a phishing or SEO poisoning attack. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/8340819158.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u781l01pc92fm2394jccs9kqb7/ziwonulesamowurapazoxab.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1q4ag027r9k1j3r2cl9ne4246o/99357061924.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/203a1d5fb4ac9a041aeba886ec19bbbf/45711837751.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0b08f332---puxametebe.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/fenavotejezamawek.pdfIn PDF document text
    • http://lidata.eu/files/35261625385.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/kerowalozonileduxerowokam.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/vigenexunimukisadunaz.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/94352412356.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/jazemefoke.pdfIn PDF document text
    • https://birudongker.com/contents//files/60107285931.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/88982585208.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/pulapujirumevutazanirux.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/40820194220.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/mazabijusejowoxosiro.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/jizutewolibe.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/bonipok.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/tuvuxizepapipibegin.pdfIn PDF document text
    • http://askaudit.ru/price/wovojotu.pdfIn PDF document text
    • http://ashioke.com/images/library/File/75273292176.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/34cda400e324be4889fc9bd0aabc021e/goketivirorevi.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/putiwemajok.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/gupagoterubogimawunalogep.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/875be15c96de4e22fda2e8f1beebe82d/toregemez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mf+hussain+highest+price+paintingPDF 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_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 16836 bytes
SHA-256: 4cb40fc1c334b07b5cd803fc318ccfeda41d6a7a5a25ddd4a42d224c935f8332
font_02_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 10688 bytes
SHA-256: 468c1571400316beedc8a69bf37a2231b362afccf42cafb8202a00b96f321e10