Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19cc62a6d85f4a4…

MALICIOUS

PDF

74.0 KB Created: 2021-09-27 07:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6db9de69c116d373f0aa581b4f86c1c SHA-1: 9e48903a191c674ace06c1a2ddfb1bebd066df9c SHA-256: b19cc62a6d85f4a4f6729e19270befc4ab20b8cd5d385db394c8f6ef51813757
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various external websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs to host a large number of links, likely for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=emoji+faces+copy+and+paste PDF link annotation
    • http://azinsaghf.com/cache/fck_files/file/99205870694.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1953aa9ddbf57423b6975d56be97e96c/85501479514.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/62180975664.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/dujizijiriw.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416514bceb9---wemigorufulaw.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614218b95d6f0---riwotutimipozolotekaxa.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/nubojomovuwo.pdfIn PDF document text
    • http://marketingnews.fr/images/file/35376065401.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/45100559169.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/270110024218.pdfIn PDF document text
    • https://zagi.hr/files/xafelokomufezos.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/banedudozan.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/67412451875.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/55163112990.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/020146087349.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/ruvulurenole.pdfIn PDF document text
    • http://podarox.ru/public/files/91403186178.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/wugalafesafuzu.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/fitirexu.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/garugobatomuvaduzi.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/29972944947.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f82d6c9916---rolododarodexupaj.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a232c18e3---42529194406.pdfIn PDF document text
    • http://arablift.net/userfiles/file/dofomesalisoxon.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_off0000b936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB936 10860 bytes
SHA-256: 68ad97a2f7bb60a2cb36dcac17a4ceec64776f1ea480a7aca49ddea170b4d6cf
font_01_sfnt_off0000d248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 18712 bytes
SHA-256: cbd48b834e1999a452528a26839df665796cb47d63839ad6fb3b771d2fb7b890