Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19631130ebc9232…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 02:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 090c52d77f436cf5707bbe07e1a7a6c0 SHA-1: 9c0508524e007d45d4fc7f83e0acb071ee761568 SHA-256: e19631130ebc92320112d64668912c6bcd02411b3133b0216e2cdde83884af98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=eberron+pdf+rising PDF link annotation
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/mvak95ramr5a4ebcgrbupvcse5/xepezatirexadotazolu.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/2567139638.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/53a85f5b51867f86d8ecd4263c7a0bd2/19665789034.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3dad04765cde2780d24085b1bc8f97dc/82757526000.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/wuvezalozavorivuz.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/bdbff80540eb4d46063f9a1393ae528e/66815734128.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/520af51a5abc2ff14471fc03d2bfefb2/35087963285.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/91997835849.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/72100e8061e3e8d85903629a9551bbb5/46338439755.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/25122548621.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607578a0c3a54---55081553026.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/zonogilu.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ecf1c53fe6d425bd6cf75299df651524/jebuvodulotufoguked.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd60303d7e---57586420306.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/pogogujax.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/lotorakata.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/xegikov.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062107013690.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/70159574426.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/xizimibabewur.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/56723362629.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/bobopabixutejativ.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062216004270554.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/vogeb.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210611_7ED42AF055EAEE6E.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_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 10492 bytes
SHA-256: afde689cd48e7e2fbb2ee2aa3b638272ccdd49f22626a3649de83ce59366bb20
font_01_sfnt_off0000fb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 20968 bytes
SHA-256: 8e52819a13694bdc59ddc3620f68d7fa8bd7a26797c725f7bc7b4c515118c6a6
font_02_sfnt_off00013216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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