Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ab187fb08f36ea…

MALICIOUS

PDF

93.6 KB Created: 2021-08-08 17:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2dd202f10ab83ca642a263f475a8b88f SHA-1: 76030b548e7fce769ed0d6718182e18e126c2983 SHA-256: 20ab187fb08f36ea4542e66cd5c0411bb32a62c3988df725b62ce894bedefa97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a225de94dfb---rebovifexavuzuk.pdf In PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc1b4d8b6---kuvizidexulapinu.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/fa0d189dc3c2d8c5cb2edcadf7b26c13/fitukumojojapan.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b919be7a667---fevimiruzamow.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/77673629635.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d2d6d5df7aec7d54ed9bb930f5799904/pisuvabapinosefi.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/57383134599.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5e6480b9d---68910032988.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/99746466482.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nexaso.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/63557284800.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/088dc67541b89620254c0c1d490cec91/wefixinetotisekudi.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/8ba18875e453bb8229e32f607fe09e6f/24168193655.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/robegikijutoxaruw.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07b69c65b30af0cc391739172434e0aa/rokewurarenemexoroferife.pdfIn PDF document text
    • https://tavio.ru/files/file/wepudanodojusi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6131d8465a---2307463169.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/72210329453.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/varemax.pdfIn PDF document text
    • https://petek.biz/resimler/files/walenebup.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/89984681009.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202106172146029377.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/nujubewibojoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=church+visitors+card+template+freePDF 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_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001226f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 10976 bytes
SHA-256: 04e1613ebb75032477e82ea614d8ea064922f0eb86e9f524058b81cf8424d1ba
font_02_sfnt_off00013bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF8 16968 bytes
SHA-256: 94aa64d7a0d1c3f65be1d003e68f1facefb14e8aaa379c4b170f316c46af9fa3