Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca42268829e6b2ce…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 00:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 79432ae2cfa6d3a5cd2f583d0aaa015e SHA-1: c085b8c778e8052253afacdd91c371fb651efc25 SHA-256: ca42268829e6b2ce37bb1e52dd78c375b85057d1ec973eac2c44ed83cf2d68e5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=outfit+baggy+pants PDF link annotation
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081a282267b9---wegonuwanuk.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d18cc54aac4---42752474347.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/fbb812d32dc2b3d6ed6d8030843d9d94/dojudikimikuzavozi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5107fa8f36---dasovozipewinivejenofofek.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/at88l0di91kobac3r26t566sai/balixolatika.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4102c1ec---86236821288.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/986em1dhfvgvftn6doh7736e51/81774517108.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/1845620046.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/78047196065.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776a202c170---21540694247.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/32364a90a3bf121bd1030f5c27a72dbd/jipebupek.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/59337869520.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/458fe9217890d2e59cae3278fde65af6/61664360387.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933a244b8b0---9986606324.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb1d71371---tegobakasazodulimanu.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7980a6fd---15311543610.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5fef14d6---ruluk.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/35782297042.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/dekewa.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c18e6f1dae0---xejitizogitubewavujirav.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7f8c54f82b5cd9e17f9beffdff08148b/39862492002.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504233630347.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/29e944b1609b47f8672ea0933156d713/fubatuwemiliwivabedofo.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/68910492862.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/51cd496da22105e6521665771d6394d7/bolipagazugigovevik.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af816e5e65---31104115321.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/b02jsmm9bpnig2hn8kof7sk0c0/43237386243.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_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 10516 bytes
SHA-256: 3de83ea75b8cb89bcfaec5929611ca53fc27b6a2a669b3bb6d59586f9f4615d6
font_02_sfnt_off0001240c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 17476 bytes
SHA-256: dd794acfdaf8efa32da7d72f05826f828babb9fb6a014cf3a05e7bdce5fd6a7c

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