Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ac21d0c9d1a90d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 06:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a1897b72c38cbbb4bd1966f28f0285a0 SHA-1: e2bda1b966182cb40dfe5c204999cff63bf19c8e SHA-256: 61ac21d0c9d1a90d95ab61aa1de7ddbe3e6a6a0d3d7e472bec092c8a2ee5b452
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The embedded URLs and link farm structure suggest an attempt to lure users to malicious sites for phishing or further payload delivery.

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://krisoc.ru/uplcv?utm_term=pubg+for+android PDF link annotation
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17922393751.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614168799b5b3---sarizilapumezilajejoli.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/15069444124.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109141425075897.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/h6v9cftf4lum71a3rhre17d924/fejewamigowiwevinivajefun.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405effeca58---lidumeloreranez.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/fobetobekenarav.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/vidulasalozupega.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/47397281.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/39348308355.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/zigituwatumikibadexi.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/64506638679.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/81667655491.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/51800676539.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/lelubutubewulutebotavix.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e93c922800b5ebef6798f4135331ae46/lugenirerinojewulirirefe.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321d97d6303---nilisalebuw.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36b04254f892a8d97f719da754d59269/47329691188.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/84537109508.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/dd4ec664e840109fe02be51882da3a96/76978078262.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/4206930647.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/83763055171.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/vepabefokusumu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3b46f044b697633eb0559f18af2a6a7d/36160836223.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210908060808074759y8kojy.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_off0000de5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 10324 bytes
SHA-256: c6908c93dda3d6ada06aeb54d434f9c72a836bc78ef70b7f86b157dd28f64f78
font_02_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 17960 bytes
SHA-256: 66eed0fabbcedaf372438989f9104d6e2db770c0d9bd53a84bad1a4d425b5f7d

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