Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d2afc80e595c6c…

MALICIOUS

PDF

80.2 KB Created: 2021-07-06 02:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 75a398e2127db308a501b7b70631a23d SHA-1: 15fbc6e1daebef0c95ce40ae3d57944fc38dac34 SHA-256: d1d2afc80e595c6cdf97f067e216cbddd96e336f562b6295bf82803838b2a8bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. The file functions as a link farm, with numerous URLs pointing to websites, many of which are hosted on compromised WordPress installations. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content. No scripts were extracted from this sample, but the overall structure and URL analysis strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=types+of+graph+transformations PDF link annotation
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcd0c89180---kufajatu.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/68663097161.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/29736428335.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c8d1d2d55---57890801068.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/imhuaomavbcekmpts45qiqqnn0/49866061655.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210531040151.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b63aa926c4d---mevuxi.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/15597830644.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3902272518---jujamisurebotakujisavo.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/35c056e54a272f99eba3c185891b91b4/fejesikulazewuserituwen.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16087356041f81---zexuwiziguvodofufadev.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/puvibotenojegajo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e55d6f1327339a8625f5769ea7656ae6/31311450593.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/velutikefamudovabeneloze.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/mol7a7gkuqsdkhama6hlbbe5ki/9441061601.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6af235d03a6564e5f768ae73abba4860/zavewizojojefuwunar.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/36426712241.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/3389237069.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4228a170c---watexopobimulokewij.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ca64739a10ac245033f2ab94d6a06edb/40919155872.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cb143153f---fekugeto.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/370b7af1fff232326bdabe95c0c7e13f/gokog.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/bifofopadebom.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_off0000d52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52F 17584 bytes
SHA-256: 3984c9fca590c10f9e3967426c202715d4bcc77c316a6dd6d867bee363c8dbcd
font_01_sfnt_off000102af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 10836 bytes
SHA-256: ff9a0eb0676e86b53ad1a57bbd94c2a428763bda3806e822d646f43fe3764579

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