Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa3124fd90b272a…

MALICIOUS

PDF

87.1 KB Created: 2021-07-30 19:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd198df45aa574e52514930f80b01f62 SHA-1: 6e4e4486e67c360b695c9f9e146bd6b27e070099 SHA-256: 7fa3124fd90b272aa3fece8245c0a348e7e479d327830dd758f216dc8f2ae9bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are identified as compromised CMS uploads or disposable hosting. The presence of these links suggests an intent to redirect users to potentially harmful content, such as phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://rpitrade.com/ckfinder/userfiles/files/37640974751.pdf In PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/rikoj.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/33dfa3d0f001cdae4dff61372e8e728d/pumalitofarujat.pdfIn PDF document text
    • http://health-bridge.in/upload/file/53836161436.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/fexolo.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/pufowobi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ee1a76287f78acca5f2c464bfd57ea7b/52577208025.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/ragodoxegimu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160878cd3a7b66---zerunebifipodofexed.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/23574000264.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/sipigitagoposafivu.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/xororitizimogozobejonit.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074372f13d3a---milupigilomizafosaj.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fbd692ec4---28399467803.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/b8hiqvo7cvfh5lunimma5i7o22/vodalavikisirebizit.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/pasitazikowi.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/16483526046.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/peberofuniletaza.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/momumibeto.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/eb045d05be1f64e2d46939466785d477/zudozuxirulozasubibedekix.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c6579a97b016f192f4c2964748482995/70043792849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+coconut+cream+pie+filling+with+vanilla+puddingPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/26027619779.pdfIn 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://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_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 11236 bytes
SHA-256: cea1f04eb306ad9e200914b72251b0af4b0588f050d255f74fa039d58776d789
font_01_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 17764 bytes
SHA-256: c192586635876baf318447a177685d3c56cb7a9f48a48efd0cba8b0a1279439e

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