Malicious PDF — malware analysis report

Static analysis result for SHA-256 318e9c937d776fc1…

MALICIOUS

PDF

74.1 KB Created: 2021-10-08 09:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6200f934feaf98e7fd97393c10638145 SHA-1: 0d64b35b82dfbdf3f3ac7edfb48ae7eb00a9a4b5 SHA-256: 318e9c937d776fc14d7183c5bd6d96e16e7ba7ec8d528bd5741f2fe017afc500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=music+education+meaning PDF link annotation
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/db17b51efc4df3d6dfa41c487fb271d4/kikobawisarobogibosajejen.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/defulajenetavaw.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/marusuninabesitega.pdfIn PDF document text
    • http://riph.pl/userfiles/file/2528979739.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/bc1144c9c5ec2a1880461a10a5efc8f4/tekisina.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/27340416798.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/63603333699.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613d95ce9b7ba---31410645824.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/jivanewazipevazinipiwuv.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/butapa.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/75244963912.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a2b1b55e0cd1555c0b3205722af5e0b6/80098367835.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/kebepebedapixojizefurig.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/wokepifurukofezoladegufaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a7fee0845---12510640979.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20211008064419.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/sonekevotiwisijame.pdfIn PDF document text
    • https://etadelloro.it/images/file/84006210902.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/11342864498.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/87752310887.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/8hvbhdbf7gs3gajucto9au8h2m/pujizojopuvamukojumepit.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/31274964858.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/nibebutizifubum.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412655d4aaf---pibasugomolur.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_off0000bd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2C 17692 bytes
SHA-256: 7e44aaf18cfeaf0e7b9d671f3dc69990d3f6b7fcd8960873f3f94c71e7d3d9bd
font_01_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 10660 bytes
SHA-256: 0bb4df3d4e5122496271cdf807508432f593297d3217c0633e57a6b8bf607c6b
font_02_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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