Malicious PDF — malware analysis report

Static analysis result for SHA-256 075fb8a5cee0723f…

MALICIOUS

PDF

84.2 KB Created: 2021-07-08 20:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a26952dfe57acfdcf732ec15baf5123 SHA-1: a4b39c9b9ea48e8767e3a163b1e370ca8aea12ea SHA-256: 075fb8a5cee0723faa704c3f1967928deb87b23b2d400b624a01186d4864a23d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://adamlegal.com/userfiles/file/56470586780.pdf In PDF document text
    • https://wickedcheesy.com/images/file/78599691444.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/wuxubuwefosexedisawo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3e488747b---vedofozuvarotesedubizopi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab38e1cbd0f---5269703217.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9b4cec0cb---tivixudobinuxasemoreve.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/6c140513ccc22684bb8f7617b72f3ef7/63990227597.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210627172051.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/40674794298.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7321d8539---suxalawisivoli.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/vujijijabutofexeja.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609060edd3cd5---67438412267.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/fjtfl9leqqa7i9l4obgo6jp0l2/66665550544.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/dadovufeju.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b3204628---refegefapirim.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/gnne2gcf3u2lcms4r3nlqou841/63302636597.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210627_D5CF6FA1ED0B3B1A.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/gezotalofibejeneda.pdfIn PDF document text
    • http://wenxuezj.com/images/File/15374312996.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/xudekezop.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/3111267878.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f2afdb0ed803cb6461895ab0a828099a/zirek.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/8362197184.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/95970b63df3ef7ddd43da7c062138f81/86324479596.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/50048477656.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/gitorarodukuvival.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/14583179227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pet+bottle+recycling+project+report+pdfPDF 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_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 17188 bytes
SHA-256: 9701ee39b8124658532bc8da1021531090c6f5da569a4382d06487d6504dd0a5
font_01_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 10852 bytes
SHA-256: 97452c213ac6f7b26940539f66817471237f3a81c5437492781256b463c9091f
font_02_sfnt_off00012ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1