Malicious PDF — malware analysis report

Static analysis result for SHA-256 52222ecf2d39fc79…

MALICIOUS

PDF

89.9 KB Created: 2021-06-28 08:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fa6e24bebe9895e50c2b6c99d5274798 SHA-1: 45ed50c26ccc5ce5eaf01d6aefbb00644289cfc1 SHA-256: 52222ecf2d39fc7958bf61078a292b97c3d984505d897aa62f1fc76dc61e227e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a phishing or scam campaign. The file's structure and link farm characteristics indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://krisoc.ru/uplcv?utm_term=executor+in+a+will+meaning PDF link annotation
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c743ddfba51d9bad2567a2656466f5e4/76281493882.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb803b9c46---bumik.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608210e2ded26---nuxetejigodeko.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/71203714914.pdfIn PDF document text
    • https://cristalensi.com/public/File/30774089984.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b8edf59fe0808e979889483e0a54dd63/56520186651.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/vunana.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jipegokuwedudena.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc1ef9d4ed---ginarem.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/obu8552799uhbgpgcllguc7bjn/95521422852.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/65331531997.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/rirubo.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/fe8ea65cb93dca4747e8151d6f157100/nukejunalo.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/feguma.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b2b49dfe7---jomumivosufatalakokugo.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5eabe744580c56d702d14ba2ed36818b/gosimerivujumemevevuga.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785340e9dd4---6705706700.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098a20c45e87---niwejirabob.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/dodajixuvamojutunizonu.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2776ad6d54---53229576328.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/45908684719.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd32df1005---jugamotus.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/23502009268.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_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 10676 bytes
SHA-256: 5f6dbff8ea5a5aed825086ad009c53abb953df331286f70bd5e47eaa4187843d
font_01_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 17480 bytes
SHA-256: ff99a5789d67a5912bab10166d8d8306040e2e359b5ebabb569c67c0164984d8
font_02_sfnt_off00014258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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