Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc6fedc64c22ee0…

MALICIOUS

PDF

75.5 KB Created: 2021-09-12 10:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6781c419786e75f0398feb1372736840 SHA-1: 000cf4e0d9a908e603fd28f758378a5f41062410 SHA-256: acc6fedc64c22ee0b611950cc40e073e6fbcb696dd421d531e7f45322f02b1cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malware or visit phishing sites. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d25764322d1f887aaa9231f81fd37b55/gobuvotip.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab909ede0---56907552557.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/18660926169.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/18874936423.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/zoguwevawakutefeturosak.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/82946184305.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/dinamit.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/tutixiwunuwud.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/92050061743.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab24bcfe2a---74308011714.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/22711155012.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/wikeseni.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/97157938103.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/mipiweja.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/nitobofelides.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/fefudebus.pdfIn PDF document text
    • https://toocapen.com/files/sekilizuxarov.pdfIn PDF document text
    • http://synphabase.ch/upload/file/babikuditukogunelu.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/91580499178.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/21262812044.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109011930448700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=top+five+population+country+in+the+worldPDF link annotation
    • 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_off0000c4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AE 10880 bytes
SHA-256: d6cb0389337e30c9e0df2ce7a7ddc23c6d48054be586dcaa9c78222d23330e96
font_01_sfnt_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 16480 bytes
SHA-256: 0908e7c116260884c871f43638529aee54812a78bf80ce6edb2fb675b64bbed4
font_02_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1