Malicious PDF — malware analysis report

Static analysis result for SHA-256 821e9576036fe0d5…

MALICIOUS

PDF

85.5 KB Created: 2021-07-13 23:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed5c952d2e577e097a2aa3c8f8c0d4fb SHA-1: 8da1de7b50ece4814da5ffed4e103306f395dd5a SHA-256: 821e9576036fe0d5a2a2a4369dc30cc55cd0763ec66eb4b3cd9521911749c7ab
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a lure, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=audrina+dancing+with+the+stars PDF link annotation
    • http://wallsfamilyreunion.com/clients/876683/File/delifeja.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/2c20a8a058c894a38344d246206222c5/30906395745.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/hos951oj3mbq4kcqnigpvjjgc2/fixoga.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/ad26e31c66e18b8a8148881520f99d63/menor.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608345bfd807b---turaranugutazam.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/zedise.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/20065850846.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/44804532a74be8742630fb35855cb93f/69139508540.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/3d4ce83964d75940a8959756ccc6c181/75948478696.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609947909860b---safisexigopuvulerob.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/pidiro.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/af84737ab67527cb9b087a37f28f72a8/10593402293.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/zupepulenebukolumewe.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/87026208846.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/87841290167.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/bccdfe8dfcbd5e06d0b2d0b1b3c9fae5/toxajevokakowapalefatok.pdfIn PDF document text
    • http://alltechsro.cz/files/xevakowuzunutuko.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16095b198bdcf8---50180278291.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eacbcda6b---lemidagaz.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/56165496147.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c3dc3fe20---nubizesamekusukafe.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/59506754931.pdfIn PDF document text
    • http://e-sportis.com/images/upload/sawegafijazesegob.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/95792179368.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_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 10652 bytes
SHA-256: f3b041b72fd89af9fb3619370dbc580b82523e7dc6360170514c8b1c390384a5
font_01_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 17832 bytes
SHA-256: 2e86323da6b1f670a323d8a6c2e2fd62dce3d43c607bd1952b44d7598bb37690
font_02_sfnt_off00012f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.