Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2434ed02f5f5e3…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 09:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 42c9c9fb59761b5da0a13175c70f3d5d SHA-1: 2297f7dbcc4bcb673fe5b2012b52ef4357b681bc SHA-256: ea2434ed02f5f5e3a370411bfb745f8c066aa10e55d55b6a05ef7dd49f44c081
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised CMS upload storage. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=how+long+does+speeding+stay+on+record PDF link annotation
    • https://dolphinsolutions.net/ckfinder/userfiles/files/34510935276.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/gewetapugakalobese.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/76225966601.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/renijiwivoruzor.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/rakujo.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/duwedujororefodisab.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/9604539932.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16146dc65b54b3---50538073693.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/pesedifoxepuj.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/635184961.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c3952153d---wobopubanoxaj.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/rojagujinixovenerik.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138331de929f---47338955628.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ad8da52dfa6a9aba0d426a050d44e88b/55763100366.pdfIn PDF document text
    • http://herve-coiffure.ci/files/zuruxezijezuloduvago.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/wazijogepetetedu.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/1046804942.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210902145122934.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/27101388954.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v105rp1bjvo5jecbo6u05njfhg/woliwufowununexifap.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/88079268732.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/lixul.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_off0000b1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A4 10880 bytes
SHA-256: d113fdf2c6a2f60b09227bb8ace0a33df22056881150843e41ab4800411e351a
font_01_sfnt_off0000cac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 15704 bytes
SHA-256: 3590d05a47e9772ad2419d677c19975f8a4ef82c77f58d863aa9dbc69d9ea0a0
font_02_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1