Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7516af4faef9037…

MALICIOUS

PDF

95.0 KB Created: 2021-09-01 03:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b52faf641b61ddb37d80f6d127b50750 SHA-1: bdaaf832ec831d09f27e87ee7e5b151a327d31e8 SHA-256: d7516af4faef90374f51f0135fba36b17165bd0184d7e46e80a94a44c5b24ea6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://ithalattagarantibelgesi.com/resimlerfiles/34460068127.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e1be49e8b---kakuzifipodosozan.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/bezasobakumufipumuk.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/aaqs4lguq4e7llvr6lvi6mkl26/pumiw.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/jopolomupomolozoweb.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/98494449884.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9db6657d6---vozifefanusigow.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/574e1d50b3b01c41ee33d2f451857aa2/tumel.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/7559940302.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e88414a8b---41157414725.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/5474050922.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5a18be577ea99bfee1d508654c8a4681/80049704199.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///18427272244.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/69841746672.pdfIn PDF document text
    • http://rc-modeller.se/images/file///3838530280.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/xesekoloxopefa.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/zopedo.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/34800662603.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/gigas.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/59fd4870d67a9ae9e1b20dd885d96bf3/gifikowobasunolewifiz.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c3f17b9a2b115aff5d187ea05851a493/xetuweleteritatiw.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd9b33c82---32074579416.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ca5d8c52b---mokikubesu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161294812b41c0---tapowajekesaxenalemekirob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=123movies+new+linkPDF link annotation
    • 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_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 19616 bytes
SHA-256: 1126de775507463bfc6c1693e1cf5bcf8d976fd5145fa551b5ea7ea4cc120915
font_01_sfnt_off00013ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED5 10400 bytes
SHA-256: 38aabe61cba9033531c9add998e55a63e25a492acd055fe50c65f8a9b5b58e67
font_02_sfnt_off0001566f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1