Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da7aec002ca5fe4…

MALICIOUS

PDF

79.7 KB Created: 2021-08-25 09:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1872e55a0c9b2238d4069563ef777a07 SHA-1: 938da6627c7af5b2c0b6c14c13db6de0ac3e9c71 SHA-256: 8da7aec002ca5fe4f59fec86573e07dda613fe4a57b1fd262f4b08bb86f3d9ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters in some URLs further supports the link farm and potential tracking/phishing aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://insureavisitor.com/userfiles/file/tidokaj.pdf In PDF document text
    • http://thaiboxes.com/piceditor/file/selejizif.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3bd2a4fbe---beruzidive.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/vijufusede.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a420055ee6---burajudeje.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/893a1c8a1bd67a1b21743c9b93e1d833/fawelibidota.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/bujotedogalole.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/85f075545116c1f8a91cde4ea19ee3d8/98215213110.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/18783592336.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/36766211001.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc9af20fe---46972175608.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608285b3b5801---kiluwakajanuzesam.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/16b86c47fc914d966db795aba48ae79e/linadefevirum.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/vorodegovikuximoxewudal.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/50688879564.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2d1b16f6bc24c2ccbc78de294df468d2/73534042101.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/zemofadu.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/c4bn9gna68a8slv4uel462njq7/pimisawiledipatubosoroke.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/56472272328.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e63ac17df3d5aa9bb00d425356fffb9e/jofusavomigomizuza.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/lasafiseromejozexoxazagif.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/463572ebe64ab04c62002a5d58b6700d/lekotuvusozogirogexe.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/kiviwapun.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082e6306b4ac---78952087510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=could+go+either+wayPDF 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_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 10588 bytes
SHA-256: 5456f225e74a11e984e36407db25f4f2e8423636ec7be12ec4af8094754a1761
font_01_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 17556 bytes
SHA-256: d2532e364f812ee5fb9b1bc523d8a85a688930dbcf4d3642cc93ee9a9a0a1ec1
font_02_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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