Malicious PDF — malware analysis report

Static analysis result for SHA-256 80bc0b2bc3a445fc…

MALICIOUS

PDF

67.8 KB Created: 2021-06-12 23:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 30bfcc593ff9a37e6b788785905be44e SHA-1: 644df3fc8d1f14f622d2597fd5195fc86eecdc21 SHA-256: 80bc0b2bc3a445fc9de32de7b9c23368a23114cf410de4d4084eaa9c8ae2c5e2
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to an educational workbook, likely intended to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=family+and+friends+2+workbook+2nd+edition+pdf PDF link annotation
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/8c4ef53ed82408aecaabaf646253adc5/pazef.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/55861920278.pdfIn PDF document text
    • https://webmenuplus.com/images/file/xukenatojidagag.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/lkhkkh45a6pknndmrrc8s3jv55/tasivodojifadopema.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/11d3ded4c87aaecc0bca9406c46ddc73/18743789048.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b71da6277df---64323072826.pdfIn PDF document text
    • http://gyobel.itpublic/file/xumudosimikaf.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/18fldqrie2snitvb7gqn8vk8pv/rizuxatupuduzurula.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083604c7b385---82434766462.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/98323378730.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ca9357b80edaa763dade9dfe5649ac70/sikasom.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/21b6ff176ef7dff9b9d548fd8c1b800a/25554255313.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2658969b8b---9707725844.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b139808a68a---mosagomujitu.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ndk4jd6a1it7f44of0eeo5jhip/7240950652.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC437 5672 bytes
SHA-256: 6211d07295570afc7beb787944f8f0139f13fce595cf4d4e702bacc8f886a3fb
font_01_sfnt_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 16080 bytes
SHA-256: 8e4bc52ac9ac880abc6716c25abc523e20c8cbb21e6d57564bc576a913dd1dba