Malicious PDF — malware analysis report

Static analysis result for SHA-256 505eb18b6a9179a6…

MALICIOUS

PDF

81.9 KB Created: 2021-07-07 01:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 193cb52cd3d43c1c6c2a14b90e6aba41 SHA-1: 2e4ac52165b6ae655adc5f257b3e264fe844b5d7 SHA-256: 505eb18b6a9179a6561fa7356a338a2efc6485fe8478765ef306c57e5d0c3ed4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are consistent with common phishing and malware delivery techniques.

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://nomylo.ru/uplcv?utm_term=unseen+university+cut+out+book+pdf PDF link annotation
    • http://edwardnugent.com/userfiles/files/xofibugi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608116b71d2f4---xufiserimuxerezuvibu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/44582952221.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/46dhkf47rkn4sk62eteuta87hg/37096277826.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/0ibbbcrh517a6n32vq5mdp1hj3/xavusetejov.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/896ogjab01ib75funjrg3m4rr7/78052474667.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1395333f7e---90058028987.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/zasotitemumox.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/mkec833cnkp4d26hi3c89ptrmt/90775222403.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecfe26c74a---vesezuwikupadasotopomim.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57ed3717c---kulaganuwubotufutigigup.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160927c88769fa---94053878088.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb60d7efa2---22382478123.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3rftk5cm6ca4pk7pr0gi14p32/66645262115.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/53825503328.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/bba9ff884b086098d71aa1462eb8c8fb/5346028797.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a490403aea5---83768141687.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7236aa4e6---38466328982.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-8/20210608175650445630.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6fbeeac25---zejunapas.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210521080356.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/976b058ec5dfcf048eebc978e7692823/60871336817.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/lejuxubaletetajali.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e87fc52903---72877172979.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/fac6u7lkfo1ulojmmddbmtfehs/68944769702.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_off0000d6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 10924 bytes
SHA-256: 19786393e4cd8ee4878de5b7985a17b046186ad4bb3fcfccc3e69e381e9ccab2
font_01_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 20120 bytes
SHA-256: 6643cfc6d55a882c4bd5b0d906f02abc7f553419e52c5a915014756e8f252ce3

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