Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e038f89bc3f41b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 20:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 615ad3796339b69b3bd13ffb8373901a SHA-1: 7ce6312447edd8a62ea3405cdb2306f549696e87 SHA-256: 51e038f89bc3f41b05bce69d55ed0886506c9d497be157dace7a297a862c21c4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=rotura+de+stock+pdf PDF link annotation
    • http://life-worldwide.org/assets/uploads/files/tebafajipigadididubi.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b6154dd3---rikewepujazimam.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c041d7ccf---kolat.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ddcc0ffab496dc0c1cb04aabbe70b718/xuzolita.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80414238061.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/540785805ac6b4116d9079ee45fb4011/86262738190.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5e2jfk1icb73l0p128ipi2lm04/ruzoxopajasapi.pdfIn PDF document text
    • http://meta-min.com/files/vigeregebozis.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082acf5f154d---63042407786.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c840e9fb83d7a0b98ba2f9ca475b12b3/kufoz.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d16ad35c6---91894526326.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/mirowulimazamuwufaw.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/78951976200.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607195485a058---54969216300.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/nevutedu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507011224804064.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f55580ef778d9205002c36c3835b8148/fipejovajabasizawuvo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160715b31ec658---55461247956.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161239ead147db---depumuguloruw.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/f9e818f619af22a46dadb95135a496bd/divunibifopemututidu.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/retubikeja.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/bagigibirerilakixijomet.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bltihi277537c909a0j1ilt9ok/86919565224.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7cd9a204---71733401009.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/zifapebiwatubodeg.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/47694538004.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_off0000d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C5 10608 bytes
SHA-256: 6623b1590a3a4513651a401ee3c80ad956c4ad12afb60fe2f79735bdfcbdf821
font_01_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 18076 bytes
SHA-256: a3fa6a48273d73a3cb4a3e5824b2b3f7da9ef7273263b122e7ea649e0a247bc3
font_02_sfnt_off000119b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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