Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8679d6c130575c1…

MALICIOUS

PDF

103.0 KB Created: 2021-06-27 06:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: c474c667b242a40d2451a061793dd287 SHA-1: be7d1089d8d53259e50185989c552db782d1d97e SHA-256: f8679d6c130575c1047f707a3f6507ef2956a1f26a0ad9b1954ebd33f1a2a841
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://crysiq.ru/uplcv?utm_term=complainant+meaning+in+tamil PDF link annotation
    • https://al-farh-iq.com/upload/userfiles/file/kititegejoxilobatugadasiw.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f6c42af4c---26600763729.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/1717756947.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1dc13d2d0---tekexakaforepaxelajajetek.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eca5c937d---bawajoludadadik.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/549c864d6245eece44a3b6d1ac883afb/58672555852.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe59fb6dca---jofowejo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885df37f279---77011369943.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/suripafepivivavut.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebef9b9585---86485400412.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/zileris.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/b2n6eqrpn2d09sc66o8tem7c6h/58442600779.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/jejobudupekabopoxos.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/42349505937.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/48123569738.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb793fe3d---lepategawova.pdfIn PDF document text
    • https://banghenails.com/upload/file/44889631667.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8958973e0---70594061062.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa60c7bc867---rilokezuzefalipiziru.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/15401389402e5f4bca45bc58fe36e54c/nedaxe.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/8673310446.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2v9p8k1nl9gngemrvjrbmc4gp8/78990989288.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_off00013535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13535 15716 bytes
SHA-256: 3ef893733b810709bad9c4fc1969e94ffeb2dc4e76d092a4e86deaeae9a67933
font_01_sfnt_off00015dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD3 10356 bytes
SHA-256: bbb8c7a5346f6c18c1c7db7d3a8673f1861dc94108505f71787c89fd78851ebb
font_02_sfnt_off0001752e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1752E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1