Malicious PDF — malware analysis report

Static analysis result for SHA-256 337825218e686fbf…

MALICIOUS

PDF

85.1 KB Created: 2021-07-03 08:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8d2dbb0ee35c0b08fe6048a4b97bc5e2 SHA-1: 0a3be1cba8a9401661181a7210e64734d2b590a2 SHA-256: 337825218e686fbfe56b4fda14ed4f3999be245e46137bdc67f8ba5e093d4046
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO abuse. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=concept+sourcebook+a+vocabulary+of+architectural+forms+pdf PDF link annotation
    • https://iva-vietnam.com/userfiles/file/zonedudenazujutav.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/40274450769.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/98bfa9119a65dc1c7d97127394eb6306/43752386864.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160deb09c6baec---jupowubefenugawovu.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/mesuwazag.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/81247582392.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41bf5cfea2---94962908653.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b19663eb3a4---5423032098.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a287414c5d7---94073250667.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/1rf4f6oecc46ompb5q9a7r6ca3/87327082076.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/87488995664.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/60068525399.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/magujuvipedenololazowire.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/59b68e5d83dfeda8f5b7b1e644cf55ca/66551126458.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8b55eb32cc848c48b441c3c3bc090b5b/salufepuve.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/q9mi5dl0p465tmcaqhqfvn4da6/puzamodijesedagonapuf.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/51214206631.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/55178651014.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f059fcb6---26447783772.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1c10e323e9e956d739d92df88bb6c58d/73369790422.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/jutezedesarorubiru.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2g7icsl0re8uepqspbkuj5fke7/gugiz.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/69687039606.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/wimomabo.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_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 11428 bytes
SHA-256: a3f4625164e5145d445055a21099b85ab225d04e0405538dd59196222c1a0992
font_01_sfnt_off00010000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 17688 bytes
SHA-256: 981228fc62ed3e088e8fae9779e64f531114a204bdd53bd50860476866e95f59
font_02_sfnt_off00012e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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