Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c11a3d0f638fcf…

MALICIOUS

PDF

84.0 KB Created: 2021-08-15 14:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9d4280b7e4afb1a5a6b0dd9fefa1ead2 SHA-1: 8955dcf7b372b6b6dbc84f39112da726d03e535d SHA-256: b0c11a3d0f638fcf9448f44611878ec08e3396c7dc69e7bfd8362e79b7a1eedd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely delivered via spearphishing attachment.

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 https://kopari.hu/files/file/36118107642.pdf In PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/341256514.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/00bb424fa9199b410da927ba07e48ace/silolemexabifurav.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/taparuvazutozutun.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd9b5be62e---81023963138.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0fab6ef25dd6f06c1a40a5e24b3e4084/dadakifexi.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/afeg3qn08mgmsluheiaqpb0573/29158405221.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/11608175530.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4cdd8a189---47474923090.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5e7c77b710a6519434a4eb0804a49a05/78812393422.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/63514792047.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/besuvilozokupuwa.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/31470505256.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16080ade564595---vetakopasofewugaxosajiv.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/kigatazesetobegug.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4f7ead6abfbf24ca21b86c73764e3659/289130387.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/de044305d2b9340ce4bffe3d2e22c0c3/nenidipidododudusazezu.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/33375412211.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021060606465480554.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/vokamejaz.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/fekirebidunexogifanepifob.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/35109576321.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/28427683623.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-23/20210523115730916086.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da08d7afd1---27475195563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=free+printable+flower+templates+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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 16732 bytes
SHA-256: 4ba8b88ca02d4d8d4ab5b0fc11ff06e47b67b66c66d99a814245b612d9593c03
font_01_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 10720 bytes
SHA-256: 365a75b9ad74e6a2d4442ad79202814f1fb5a1138be260f06a4fdde17045ceea
font_02_sfnt_off0001294e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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