Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb7141aad09d57e…

MALICIOUS

PDF

94.6 KB Created: 2021-09-13 21:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d7354ce1c606b246805769bc37f796e SHA-1: 57165b351aec44d673b98242f8b2c4bfacab28b9 SHA-256: ffb7141aad09d57e9d53cb8e1038fd9fe79daafdcde23ebf6e1c1d4b8cab90ec
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' directly support the link farm and compromised hosting findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://nocleginaplus.pl/uploads/userfiles/files/zabopitewewexilodavulos.pdf In PDF document text
    • http://archissimo.eu/userfiles/files/rasabuda.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/98350998131.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67e2db543---69158543868.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/11428222450.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612eee1f3d7e6---16754840244.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/3924129607.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/74003092125.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf256b636---94498977058.pdfIn PDF document text
    • http://njchemland.com/upload/files/satefe.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/40065154371.pdfIn PDF document text
    • http://elpijisystem.com/file/55087855952.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/tapenik.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/kukaragitazodovuxudeze.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/26943487150.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/japisagigolakijuziwixin.pdfIn PDF document text
    • https://windsbs.biz/files/file/xalit.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161397ac298297---86781525809.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/95435429748.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/83002416921.pdfIn PDF document text
    • http://autovoda.ru/upload/files/41965215098.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/lijodutokuwekar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=orions+deckmasters+androidPDF 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_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 19080 bytes
SHA-256: 2720566e43203645ddf66423c581cb40a9438eb5afd3a0f88407cd213fa734b7
font_01_sfnt_off00013c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5F 10600 bytes
SHA-256: ee60babc6f7f48c3107e5e3e29ab855a559892910871322189134a928cb10ae2
font_02_sfnt_off000154a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1