Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bdfbe12621d510…

MALICIOUS

PDF

102.6 KB Created: 2021-08-11 04:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 391a074f6b19a5db1dd1abb884e39feb SHA-1: 1e6f504b6a573452a9db1783061c257e78daf474 SHA-256: 55bdfbe12621d5103979c44ff7723f535211f8e8623451c87c975ec1a82db174
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=what+does+brackets+around+a+negative+number+mean PDF link annotation
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075efd610faa---rukasata.pdfIn PDF document text
    • http://ozari-ua.com/files/file/89214247903.pdfIn PDF document text
    • https://fuoriscena.eu/file/47996470144.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/mudakejob.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/9495841019.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c442b2ae285---lokod.pdfIn PDF document text
    • https://capecoralliving.com/media/file/91543741219.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/cd8d073414c0db13a7def75fa5e2b36f/sibinanone.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/89430597041.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/12041149186.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cd259f9fb86---46754108782.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/40718522799.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3c3a8806c---zijepazelisijipu.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/jisofazupituxepiriluniroj.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/22138728166.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160cdde53e0108---84635442549.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/58722779490.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/57587835802.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c963e1468f4---15770519968.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/86499639234.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/37971840071.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6900280f07---66931820681.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_off000128e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E9 18576 bytes
SHA-256: cf0110d0233ac9727a67d4aec849979e37110059ec553a8261326c1a6687fce2
font_01_sfnt_off00015a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A80 11164 bytes
SHA-256: 99e398444c20dbcdfcb2cc2dfbb461c87d187bcf6cfd52404dfb0c1ef0a00aa7
font_02_sfnt_off00017443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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