Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca12703fbd6bfa9…

MALICIOUS

PDF

88.2 KB Created: 2021-06-26 09:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 75f58b2a2e41a195e1bbde2df75a5773 SHA-1: 47488a72797f15bf1f498cb8df8f4d5855b2950b SHA-256: 1ca12703fbd6bfa9dc8feac97860b180a4ff3efb136f0005bc0dc6b7f723e82a
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack where the initial PDF acts as a lure or dropper. The ML classifier strongly indicates maliciousness, and the presence of numerous external links on potentially compromised infrastructure supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/3nnd6epoj75q5f3ca2fla9b8p0/jevikoxifofivovefir.pdf In PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1b33677d212921c6f149beb22be8cda1/16985781427.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f8f845e3b65a0867204fa4e26d63859a/sijipeluvejodepum.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/jbk12d9n0s114njuhdusef60e2/xowapomutapofaluwurodirir.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/56b82d6ccd9b07845f6236df242d6755/70161548392.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ba6fd881f1fbe58964c70ca001493de0/55839994005.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/52076146275.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/manidifopumimulom.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae00594582---46562476632.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/48030248884.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/3841ce8bbef00edbc6ef1d16bbf6c264/jaroretebi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077e16b3ce61---bokeba.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bbf469dd2---46371885126.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cd362f115c3---miziwijel.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/labexalokuru.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cff27ae69b5---rajobabepofifosegolu.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/38657743392.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac6d24701---29822302182.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/33535009455.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/95002868110.pdfIn PDF document text
    • http://yuha.be/_files/file/59875754470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tuna+loaf+with+potato+chipsPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e57e56208135ec1a7a7f4b74cc2a8ebe/1534205643.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/aabf0dc38c8239594fb896ec526cd799/82452735814.pdfIn PDF document text
    • 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_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 17528 bytes
SHA-256: 4cacc2d53b95492598aaa42559ce1843c7febd6c6b5496acb70f59c4e78f0219
font_01_sfnt_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 10496 bytes
SHA-256: d338587de2a8f77aa62dce11ecc557f0a8e1b756797ec5cb1087be00079b047b
font_02_sfnt_off000139e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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