Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff42b4ce406b1f8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 03:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: de559514c000aa58a3e5fe3947590699 SHA-1: 5cb938ab73c82d1c74bbee0f4a354169d9e6e440 SHA-256: 8ff42b4ce406b1f8d22e42d6315d6c71c2f170407ea70aa828867ecb496655a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://abcbyspu.net/ckfinder/images_store/files/nefozepatinotukixi.pdf In PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/gifabijejarilubufuv.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/seliw.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/wuzomiriloxujokipabubiviw.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/72766979943.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/8b16477590610b365558b8123d0099d5/59001661089.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021082411422265.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad53adc27a---wozujefuwinebotinolejapi.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/94003806042.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16121a06da2996---bejilawofosevejeviwelol.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/nufunisigexurebakedun.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608829d39cc7f---mebejezavovujegaxujosana.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/rojepapeleleduze.pdfIn PDF document text
    • http://www.bash.cl/media/file/majolefupobixe.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tv6s6bcbr7c0f9rss9as8le2he/40239740204.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b8bed508b35f5c301e117f208cb64cf7/gabamanizekaz.pdfIn PDF document text
    • https://seikai.jp/free_images/files/21537027710.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/kufasomuwopeg.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/97888546746.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/lapotemekefuwowide.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/50733080475.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/36086489256.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/m31c4bpot3i0f77vf529de6h48/73818495693.pdfIn PDF document text
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/66sj73tfg44vic0hfpv1r7jamc/29097850007.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/4ff35f032168a4dbb71a116fa376078f/5850415245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=convert+pdf+file+into+word+document+onlinePDF 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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 17228 bytes
SHA-256: b68be75ad27d7296caa6f842d6734864a5878c4f4169f03856e3391687d08739
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 10736 bytes
SHA-256: 9aed1581a6dea4b901dd8051a8e6ccc6a1561820fd984df7b836b6b96a256877
font_02_sfnt_off00011e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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