Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ece8bf6d090af9…

MALICIOUS

PDF

87.5 KB Created: 2021-08-06 13:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2da3f0013afd1a6c74ba7c1f8bbec7f6 SHA-1: faea277b5387a90d91398fa44584c78f2510d493 SHA-256: b0ece8bf6d090af916b79953991c7e53193df7eb7f10667403a18c1bd9b79a75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting sites, likely intended to redirect users to malicious content. The file's structure and the presence of multiple external URIs suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.lnk-creation.fr/upload/file/65816578660.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a9db54432---55116144213.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cade4dad334---xetitazel.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/bewujibosopukulonobiru.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/ziwuxuvu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16087826a7581f---kosatif.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c60899d42---11854483312.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/5286025112.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/xomekolizorinonavademusom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34ee6d6c78---21507900074.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/233b291ad70358441de71d351bf78dc0/vemavijudukijeruvilotawi.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/89221186875.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/ziruruvotulezovaw.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0eudgtjkf1kg8i1ikvo2q5mfgb/74265223304.pdfIn PDF document text
    • https://33mobility.net/uploads/files/relowotod.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/fba1699491bdbfeaddd088b6be21e92e/36119011644.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087f51640515---veraluruxinizazajipuneju.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/34696526840.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/kosonowidus.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/61649379266.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/edf7a863c41aefcc955090b14f3e71bc/lizotorilipuga.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/fukizik.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/sobolevawirupokipirebuwag.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/l4si12ddbt7d12uft50bn0en83/kedupenirinawewo.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/64258229953.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/zavuvise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=problemas+matem%C3%A1ticas+cuarto+de+primaria+pdfPDF 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_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 18748 bytes
SHA-256: a560b5243730052a8e5b012af3e4071c87e2bf8cc5f22a4f238f4b1ef02d0e90
font_02_sfnt_off0001336a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336A 11096 bytes
SHA-256: 6b6e0eda93333ad76ae2b7ef20eb5ecb8eeef133bc13ea7245245d069832a373

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