Malicious PDF — malware analysis report

Static analysis result for SHA-256 58159e8815745768…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 17:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95f8a92fa2adf1bb758c9d311c13a54d SHA-1: 13b703b7e80d245161bf145ba393a38089def8d5 SHA-256: 58159e8815745768935ab4a5f839ffcc609fc8d629044ac896e054e738574285
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of external URIs and link farms indicates an attempt to distribute malware or lead users to phishing sites, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://cructi.ru/uplcv?utm_term=kim+and+ray+j+full+video
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4dad3e6da---gidera.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160914216e48b6---riluwodig.pdf
    • https://hostessima.pl/userfiles/file/berizigajefuxuvedikivat.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e5e3fe01---21222799330.pdf
    • http://aytekinpolatel.com/image/files/mabafelikebefisopusizi.pdf
    • https://ltssinternational.com/res/wysiwyg/file/15082610877.pdf
    • http://inlovehuahin.com/file_media/file_image/file/10662634160.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0228a88803---83346868360.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/kizatabibinujozubore.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aab792bd172---mezebebawanemezaba.pdf
    • http://hhsbluebirds1967.com/clients/b/b5/b592d679e9980e62d9d56be1bfb8b6b6/File/46631961852.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20215192246243837.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2af12543e---79831857560.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/9c7637dc591fe6c6faf210bdd425c01f/67627596958.pdf
    • http://beiwendq.com//data/attachment/file/xaginapenelumi.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d40d243d6---8177423543.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/gipasugazise.pdf
    • http://agiusfuneraldirectors.com/files/file/bomazaranadipe.pdf
    • https://inncredel.com/uploads/jopunemole.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6f065c428df54ac29cac6cc7b7cb4bd9/ruwuxuzew.pdf
    • http://aldo-ins.com/userfiles/file/bakan.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3d946e6a4f942834228035c92456726b/99494183615.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab6.bin
3e1a5c08b99c48cfa263cac2d0fa4fd7eb77e98f3e485c9afca6077663a68f55
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 16660 bytes
font_01_sfnt_off0000f163.bin
a0cef4276c273bbe687811e0c92d182d3ebfc1d2bf54736159d3e8335d47b1a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 17380 bytes
font_02_sfnt_off00011e97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 16792 bytes
font_03_sfnt_off000136ae.bin
f6b2158202450e81a52d0d0f62280fe4c954838355eb6748dfb30b57cb472746
pdf-font-stream PDF embedded font (sfnt) at offset 0x136AE 10648 bytes