Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e425589e163c7e…

MALICIOUS

PDF

73.7 KB Created: 2021-09-17 20:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae947b7c8b2dff80b4e2ce8e40646217 SHA-1: 759186b4fff818f8ba6a70376ed14cdcb4f939dd SHA-256: 15e425589e163c7ed9f04d1882ef3d0ed1192a1a0b94ca8bf48be5e586f0228d
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites that host further PDF files, suggesting a multi-stage attack or distribution mechanism. The presence of numerous links to potentially compromised CMS upload directories reinforces the nature of this file as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141631bbc8ed---20622544752.pdf In PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/95506153464.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fc18978153fdcf1e2e7a51ea73f5442e/10066318125.pdfIn PDF document text
    • http://cga82.com/admin/File/jiwokumubewiribekusaxo.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/kepagevukuzifunumijowedas.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/87072342596.pdfIn PDF document text
    • http://esen.life/userfiles/file/86144911295.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/37942059527.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/88982794211.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/fatowiguwejozizobepufa.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161405b5a32780---nejibejed.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/78753825892.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/b95dd9cf5adacf5183c49d89b4960556/97936563303.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/hvq69t5e33dt4pkm6aiej2vpea/61798043118.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/80246920764.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/79189169918.pdfIn PDF document text
    • https://rafautama.com/uploads/file/66852644514.pdfIn PDF document text
    • http://thepducphat.com/upload/files/popuro.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/8572571190.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/sejeligozogusanekezu.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/86939705449.pdfIn PDF document text
    • http://moneymaker-gold.de/files/94128259488.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/12356412187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=chord+length+formula+radiansPDF 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_off0000bb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2B 17632 bytes
SHA-256: 73522ed2253a368a8ebb96ee8a74a1156a12d8419f56c974f6e730cd1e0b36eb
font_01_sfnt_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 10932 bytes
SHA-256: a03cf1ea173c1ec24d58d0f5f1bc855054e971013ff2b35e2ccd7d3c20a78ff9

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