Malicious PDF — malware analysis report

Static analysis result for SHA-256 86da8b168ec9cce8…

MALICIOUS

PDF

97.7 KB Created: 2021-09-16 18:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 911f64dd560609258e25478f80e9c4a1 SHA-1: 1d4a2f73e5a49a1749e1030cf6326d0205ff175d SHA-256: 86da8b168ec9cce811350ad14996ad8f3a4366cc8e1726b9eddf66b85cf2598d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 http://businessnavigator.in/ckeditor/uploads/files/62443050165.pdf In PDF document text
    • http://bantinnhadat.com/users/files/tuxefofujetuxuwaxe.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/99498546015.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210907033215.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/86770845222.pdfIn PDF document text
    • http://adveotec.com/img/file/44069014796.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/pikewugi.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/xodinawewuk.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8492ced58---83078035339.pdfIn PDF document text
    • http://hflchw.com/upload/file/52651663973.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/45306826664.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/46359729341.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/xixifobop.pdfIn PDF document text
    • http://wasael.com/userfiles/file/19214570480.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/nenojitawulunanusexozana.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/80639692699.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/44818541872.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/45340c310c8425fb84afbf45e58b7e00/43984475577.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/cbb11ac72894eff9687eaa1e2b17c989/wolel.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/13977105395.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/1763132429.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zabimogodakekek.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/doterirom.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/90952844684.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/9937689559.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/waxovaxarasewimir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=frank+android+softwarePDF 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_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001341b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341B 17656 bytes
SHA-256: 5fa73ff325a39c8d53f4f800d6c23000346d1472236cfc0b5d393237a3850a69
font_02_sfnt_off00016159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16159 10456 bytes
SHA-256: 624d99ac7964fa06640659eec137a5c392e08e54c3a4d50f1c5c194240887c8c