Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e9f97b2742e256…

MALICIOUS

PDF

90.7 KB Created: 2021-08-13 13:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c1a0a5a5d5429e8962412d2c2e7a5598 SHA-1: 1492dad4464e6dacc19df7246fbdce40650cb108 SHA-256: e1e9f97b2742e256b01d93adc5fd7259dc1f039fad98cdcfdd5a551fcf1363fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://huiking.cn/uploads/file/031418202004.pdf In PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/kikilol.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/4c187d5381236c6616bf6bbeb34af65c/11712254487.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/jajodoradezoririzojozexo.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/wuroxuvi.pdfIn PDF document text
    • https://bloomeng.com/uploads/jufederu.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd26a9d21---28937382237.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7df835ec81b61cc068426fdb07175e64/92785371157.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/53f63eabb5caf163c8c541425d380753.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887847bb128---21699734025.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/kizawovemituzososodulama.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7bb881ef3---44740437027.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/60198432621.pdfIn PDF document text
    • https://aashianarealty.com/file/75360238067.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/eb8806d5594c4469f6a60edeb850c9b8/berud.pdfIn PDF document text
    • http://biosite.ru/images/news/file/sirexafolafa.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/nefas.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/zarolabotuvif.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bf59ed9cd---bozimelakevikamexogigadef.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/131c9d774ae7a981c4ed6b9afa9e02e4/40710395380.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/22940718459.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/87323090636.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/242774b2bb8f8aaecd8d002f888fae3b/vavebidokewuvagake.pdfIn PDF document text
    • http://dzbnf.com/upload/file///44230608880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+would+you+use+double+jeopardy+in+a+sentencePDF 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_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 16728 bytes
SHA-256: 0af350f7e73f076aca8aad5e65cc1a298f9302061cf7d9ac8bd8a0cc613092ec
font_01_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 11068 bytes
SHA-256: fb49d0f82cb08e01728430f33fdfc8e52debf6336cc93afcc6ddc5ea5c1b631f
font_02_sfnt_off0001446a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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