Malicious PDF — malware analysis report

Static analysis result for SHA-256 f572d60f57eae32e…

MALICIOUS

PDF

73.2 KB Created: 2021-06-15 13:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2042bb3b200ad7cab240f22b639599e3 SHA-1: 835a0aaad9ccb1fb96f8d2679b46d6a25f514163 SHA-256: f572d60f57eae32e20ac7b73f50eba157b16feac4d80a3f081058836fd3c2047
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to WordPress sites utilizing the Formcraft plugin, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was heavily obfuscated, making specific payload analysis impossible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://cructi.ru/uplcv?utm_term=kaisa+runes+s11 PDF link annotation
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160968ac68b6ce---texumaroxobogefezew.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/12950807051.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070caaf6fd08---vevuvuladojim.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/loninenivafudogepi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a916f14cc---82798859575.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/6372390509.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3f425c193839a7fa7b167869c954c7d4/33777273714.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/dutixananixelatid.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddfdb22d60---tixubujipifexof.pdfIn PDF document text
    • http://pi-consulting.ch/download/33622130360.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/savakexofatajaj.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/91081348897.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dda43f1f3---nodopeveguzutezadi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 4668 bytes
SHA-256: 9fb07604296afce066a4c07c9737ed84b2b447eb6af086a0715a5243473c6d45
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 12456 bytes
SHA-256: f91b642ba1d1c7b506810e32ad25c6a03245a618af187357d15445aa5764ec46

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