Malicious PDF — malware analysis report

Static analysis result for SHA-256 57314706b421a6aa…

MALICIOUS

PDF

74.5 KB Created: 2021-09-03 02:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63f8b9691ea70be44cb40d8781fb7a4d SHA-1: 7d017e6aefb1a79d51db921bc81634a118261f88 SHA-256: 57314706b421a6aa80ab46dd0a412d40b0ec80002abfdc7bc670c0af4a938421
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://chcial.ru/uplcv?utm_term=livre+barney+stinson+playbook+pdf PDF link annotation
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/26fe742605cb2c4eb528b4d3b50cbea2/rovirizoboforadilegus.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/15535734960c4fa57be97f.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2757abcbe---gaxudawuzawamugigixolu.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/33159494827.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/tafav.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/69451937707.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/67274162963.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/309efe62dbc4429d132d7029635abf40/75704118021.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/c2a3a6a5317f8334ce45abbc0edbcb6c/vejamib.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d5e0a8d206b23012df3af079885678e4/musofedive.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/sekimafopisax.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202108/1629706034.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1d8b09bb85277d92187be6c97121f9d0/putaxeloruvenewikidozup.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39503718880.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/6581g8h9e09grc6kgk52fmdado/lenanidak.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/denokes.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/dilifijazi.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/gozafukijivaxapimikes.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d1705394---bisini.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/xipelatekaduvuw.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/15647986119.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/737a0055c10c235237968ad9a1847a17/56736759513.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/57d8ecfc9f5e1a9735cc58fe196dc91a/jexaxufowepepujunitaseji.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_off0000bb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8A 10860 bytes
SHA-256: a4e9da6ef5266eb3405042d3e1ec245a468544ee7bd874aa288874930f295896
font_01_sfnt_off0000d48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48A 18404 bytes
SHA-256: d4fa8896c8fa467ddff549544b60c31bb061ee547aa4e97424acb2e00189b820
font_02_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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