Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88060761c7b513e…

MALICIOUS

PDF

86.5 KB Created: 2021-07-27 01:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea73d8c49be27b6fdc85cade5d57411c SHA-1: 66d6b6375f14ea0defcf912ee72dd6f0d176d285 SHA-256: f88060761c7b513e046edb4614dc1324e89a96c53b53259f2ec49271e8cc2a07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm hosted on compromised CMS uploads and disposable hosting. The embedded URLs, such as http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160889c370efaf---zuzezojadosaveje.pdf, likely lead to further malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/89102cb5b0070d76c7f1148fc0c7fbdc/rovivudin.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aae2be5ab66---61753357900.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/guzem.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/tirabofovagararubeg.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2oaoghp8uooev9p8ckag5pbok6/52906211211.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab257aa47d1---zafalofosowutaw.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/vuxob.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/498b749f3560cf59ddc79d5e1ff68470/43332020425.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/09ecf162b511bfbdf70feba27adf1453/rorirokibef.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/mkk8p78mdbmspljer46k6v1ht0/nisimozuvadojagikinadij.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106191358275679.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/sg504l3oni4m6lcan9dav4tsp8/zakog.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/35687928562.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a0226293e---69124032444.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9c05217f6358bd4fce1063236065ac76/bipegalekujajofamefunelez.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160889c370efaf---zuzezojadosaveje.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/kilugepupejokarivibeno.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8rdctaaeje9okkcptvqrb43au4/jovepevuravovelaxo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2d7b3ab01---zenizunuzokopipo.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/6c56b6aa7ecf575d12d48dbec5f116d9/kuwekobiduravigov.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/dezugakofewe.pdfIn PDF document text
    • https://dietacud.eu/upload/file/tokozonu.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/14974235208.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/6nvbb6vvgg3td8ott7r0v8s922/26209437219.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd724a040---jurivulugeloxukogogumebow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=partes+de+microscopio+optico+y+sus+funcionesPDF 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_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 10952 bytes
SHA-256: 97f39b0fe877cf95fa5b8ba555fa53cb53170ac45460d2801ec2e044a52f384b
font_01_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 16924 bytes
SHA-256: 05fe2cffaee32ac4129fce92753d6a214421ff5c2f409fdbdf31a26f8dae02ba
font_02_sfnt_off000130ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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