Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ac5211a00698c7…

MALICIOUS

PDF

92.3 KB Created: 2021-07-21 22:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 15f185a457e4e8c90448a93e4defc3dc SHA-1: cde617da91ec649aa33057329fa4154c190f7c01 SHA-256: 00ac5211a00698c7af709a45925ebbbc40cdfdfcd1041f6377948c9379c4a3f2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/pfdgl1gkpf2j5sfvqbmdi6s6b3/juxeriterapubovukazi.pdf In PDF document text
    • https://alpinashop.bg/files/joborinefadodaromexunop.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/62523bf6259413f05c098b98715f1f69/60295565384.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/tuxozigovuka.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/5dd3789ee0f1f9283791ef42fab6549e/46126901885.pdfIn PDF document text
    • https://ivanamihic.com//files/80856392090.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/4814im7heujv76iqt251g8bg2r/89503071324.pdfIn PDF document text
    • http://beateromer.com/bilder/file/bikizikixodu.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/03e92a6ff52cd55d09306b931884af74/debenaxomelokaranijer.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdb48b0ba8---loxifegegedaraja.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aab9eb3825b---32890913716.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/9172347817.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/70605d4875e3055d546f186f4c282990/wugediruwo.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/8364179446.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b00c172986---26959150523.pdfIn PDF document text
    • http://indecomavo.pl/inc/44101771099.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f120188b76---95017130977.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/jelomilevixoximafopiwipu.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/23197458843.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/33568417510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+read+a+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_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 10160 bytes
SHA-256: 32f256033b0ebe5cd46285014ed5f7de7c611d15bf8879f6b1f8a6d16376a1ef
font_01_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D1 17960 bytes
SHA-256: 65a93818c20e531d71c7bf92c88cf05cfd9394d5f0adbd6cb7d3436b5234df4a

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