Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcd521d096f0903…

MALICIOUS

PDF

75.9 KB Created: 2021-06-21 13:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9eba37b1ec5f35376c7f9b8b150f6d8c SHA-1: b446d12b040ded97ea2048df83ebb294b7bb945f SHA-256: 5bcd521d096f0903cc71d1c37d349d61dc4aa69089c2e6e5d7cf4f5e6e61bc8e
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The embedded URLs and the heuristic firings indicate an attempt to lure users into downloading further malicious content, likely disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://philabc.ru/uplcv?utm_term=project+proposal+format+sinhala+pdf PDF link annotation
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a728014b35---fadaxevipixagiwizo.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/lovuwizulalidomepabogeka.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a998721dbd---40252663504.pdfIn PDF document text
    • http://newo.ru/files/files/zugapotaxij.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/4k8d0kdkvttoiaqrm46shbefpf/18432235066.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608762dd1b91d---lusibugutibutanawawive.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/zevedirapob.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e0f5269f75d1541ddece52e8b391c195/gisumirivuluj.pdfIn PDF document text
    • http://temple.mo/userfiles/file/rifufemiweduzevesu.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/77bd688110a038d8b0252f8eb334245c/saralutirefokixuxi.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e04e1cba19---dogawomimetemuzaxosapote.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab50bb667d1---98370353579.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/naxibatijiditijeka.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/juzetujanijujafuw.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d0ffc693d---devigebazumevi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04f69c9464---liruxemiparuvapetaxa.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899b88de248---79284417300.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a18f4fca14a---16817526353.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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 5472 bytes
SHA-256: 83daa986f8b62ab8466db2546c16099cfc094df311e85178792b2f413e207a62
font_01_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 11800 bytes
SHA-256: 9451c618a91360f9668dcb1c14591b3490d203c7b31f7fd9d21905edd97ff098