Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de127c94aeb72f2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 01:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e10cb90cb1b183830ade2b8550a5a567 SHA-1: ab0498ee26ec8dc6c10e83c066e5e5304640f513 SHA-256: 7de127c94aeb72f2981eea9d7f4980a5f4e613a0d9b301d6ccb0efb6f9f1c8aa
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to direct users to potentially harmful sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=fortress+metal+detector+user+manual PDF link annotation
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b30e108b3---77077442908.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/4762920237.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/62cbe4df2c869c6dad9e7f9cc3493ec5/47839982310.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8c88df9c2---zufenutuze.pdfIn PDF document text
    • http://riph.pl/userfiles/file/30625582987.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/16101295133.pdfIn PDF document text
    • https://baongochoa.com/upload/file/24390709016.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/69b6cc043dfe633a7d6ebaf506610a65/3120116663.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/12661629492.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/netuberizidutuw.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/95bfbd774d1a40a13a66ab5ef8c460cc/72875755057.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/16ecbc1417875255976b32ed7e5d64e9/23568515233.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/wedotanukokoludexurezijez.pdfIn PDF document text
    • http://springbook.no/files/siwukenikapotozifojobimar.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210712212455.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5fe60151---32887109287.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/fenojaloraveresidutuj.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0c4c0d829---vugigama.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/menasigijiz.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/rirerodenukitoxugabo.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/bavixexoxuvofitamor.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/vutelixi.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_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 16404 bytes
SHA-256: 805c2269781d3e820f30b7a0cfa52220c361975b753bc0255e5e1340e4068f54
font_02_sfnt_off0001279b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 10516 bytes
SHA-256: d440b30fe8678846c6781d84a08203b2a7408b3695ca42cf631e26b12969cf55

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