Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7da6f65bc8c7e7…

MALICIOUS

PDF

72.8 KB Created: 2021-09-20 21:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e7cdca08f619c2aaf012c5db03011276 SHA-1: 52f60d9a3d32a155542b6de8464f37fa25dee4e5 SHA-256: bb7da6f65bc8c7e7f151a5aaa5aabbe30289f8e380b49347c842dcc125034bcb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://parfumerieindex.nl/images/uploads/wolopatez.pdf In PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/t5vav6c40htqlpkhbhagmheccg/fonovarevukejijas.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/wafijiziladosijogujofujok.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/joladowe.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/fumuteza.pdfIn PDF document text
    • http://goref.ru/files/file/60050303588.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/xizobotesinoxixawivuwame.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/tudozakuwomopewaju.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/xamemujes.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/72552723953.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/duzenudabepolomufiwuj.pdfIn PDF document text
    • http://e-district.org/userfiles/file/1876532576.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/57290490205.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/kuroboguvilif.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef468b43a0---56991189898.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/nanulajifawoluzubagidaxi.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/laxinugelulojipugelilodo.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/73225684368.pdfIn PDF document text
    • https://bdata.vn/upload/files/rotolevesipetolode.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/balimakovokukonuz.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a04e6b6e4a---51773550525.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/kerirusipitipeke.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/15gf1cf81uvqn765uoavdc9ljf/27342912888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+fire+apk+homePDF 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_off0000be31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE31 10276 bytes
SHA-256: 6c591dca40825a19a0b45e1ac5ac27c921896c91c7026953141de57dc74e04bf
font_01_sfnt_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 15600 bytes
SHA-256: 88111f766c67cf4f71a30b41d24ba3f4f16311c6f1214aaa45027046deb18987