Malicious PDF — malware analysis report

Static analysis result for SHA-256 c023d7813c239ea0…

MALICIOUS

PDF

86.6 KB Created: 2021-07-07 04:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a2741bed9e8390f1c2302833e8f8b82b SHA-1: e98a2e6f1c005832b199650cd0d47e9ead4164a1 SHA-256: c023d7813c239ea09e999d19ad7b1c86ad2cf61a2aac0dbd7b3ead4c2ad4e96a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://chcial.ru/uplcv?utm_term=what+is+critical+essay+writing PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b9b25c877---gogomuxesafeziparijanen.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ecb6b473---sofenunebadogatok.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/paparijokokes.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7991224ca7487cccea67b3f1935e65f4/20463842315.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0981aa4f383f71ae6c1a4200f449fc1f/24289302589.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/73046232567.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/24ecq08u5gsheq2ci1a5h63npl/42825105544.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff8e97f29---tusavuzalufogifaxitugi.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e3031938e---79334535991.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb2b33420c---68077467455.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4ef37e2c388376b573e959e25d8e5245/27852265772.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/66774841142.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/dofazefavez.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/395b36e99fd5af210060d46834842be9/foxuvitev.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9gu9ra8oo6u7uv74isptfmq1l8/61844104581.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/funexot.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/3024934528.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14f51f5c6---xuvexaxet.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/1168d5e7aeb6434de95b73dbb7540428/78828722927.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/40149764054.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/xixekoxajosuvugiwigazito.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/9ce42788d75bbe739914f594b9cad2ee/22770923028.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_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 10584 bytes
SHA-256: 3ee20a5fb355cd89e7f687fdec167c47e03d19af86f9130fa31875e620cb5224
font_01_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 16836 bytes
SHA-256: b8661f8671ca711e1512e79e2e4ed06da61f71d13f1f2732222ae20efa0cfb61
font_02_sfnt_off00013583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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