Malicious PDF — malware analysis report

Static analysis result for SHA-256 859c446dc94b3a1e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-19 15:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 202b7fa16c54bb573cef628b5ee13a4c SHA-1: 45cd28b2b41058cd4e6a9c5afe0736f22c9375a2 SHA-256: 859c446dc94b3a1e3e92d8056dfd1d67ad97e544a177d3dc9fcdb8916042d68a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farm heuristics suggests an attempt to lure users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://irlanc.ru/uplcv?utm_term=free+watch+spider+man+far+from+home PDF link annotation
    • https://mediaget.ru/userfiles/files/tefefaxelew.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/71203436748.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/ravevudumimomug.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/nidoxipunen.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/dezosuzisifazum.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/71174285382.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/75786715340.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16140ac006f59b---sutuduxavugi.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/62705997865.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/titedimu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c929657da---55830405510.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/kipowerobukawokanaro.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/xusuvakanumowewirobeku.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16145e1658969e---20701914870.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/89587125935.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/xunenutujofumevet.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/77288581515.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/nibebizazifu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e2c337b04---bokisefekoto.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/88450536417.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631382698.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613435e407697---rezefapekosizogujulo.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/25761448424.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/7301442869.pdfIn PDF document text
    • http://pasted-radio.de/web/files/22708122331.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/pofolu.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_off0000b70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70B 10904 bytes
SHA-256: cc5d36bf14fc765e6416543b45acfb1c1242faeb3c565a36445fd5ab59605d58
font_01_sfnt_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 19380 bytes
SHA-256: 330318c57638afd18c97e6edb32fe3a5951705a19735f9a39b0e28ad65472735
font_02_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1