Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bcbc50f78a95d8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 07:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 133ebac7e0eeb6cc2bfdae162b81ad46 SHA-1: b6fdea95ff7c89de489dcc097ad4b54bf5eb3c85 SHA-256: 15bcbc50f78a95d820170938afcf2fcf7f667ce2b7d0aa8924cbfa734b1e4b49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=inside+outside+interior+design+magazine+free+pdf PDF link annotation
    • https://12shio2.com/contents/files/simokububivesozinumar.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/dixuterizako.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d100cba11d19c5bb68f6050009399fd9/nozoludorug.pdfIn PDF document text
    • https://bamor.org/userfiles/file/nimizi.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/gigete.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d868db5dc0777df2ed1510b365650393/mikuwuxinofape.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/netava.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/30440480782.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a196598b8a---38912186461.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/6bcfbef9cc867afd8abf5e9f0a1c0eed/litotovonivas.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/epgqejpn95d7i68obousiuslr5/78279175482.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/15562723066.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7da7809b464e87d898e62e072562fd2c/desob.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vac93h5je1f47tfoqsjdpvg3tp/pomuwisubogidebibiru.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/36333681906.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/45d4110500cbbbd9f66b3b4154c631ab/xiket.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/sezemoturuninefojedeziju.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/furis.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/kuwezamojawelolelumu.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/88506231527.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/54417921879.pdfIn PDF document text
    • http://vit-physio.de/file/retojasuturiforata.pdfIn PDF document text
    • http://abpaluso.com/upload/file/lebezoxosulifulorivimuko.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/gazixuvibedotoxu.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/153b81f45fdb45e647e8fea72b70af73/zepixiwatevoronadizet.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/71769067177.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_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 10908 bytes
SHA-256: 67569231368b223448f448069985488d7cc49cee276c76824bb20ed102021420
font_01_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 16796 bytes
SHA-256: 1b3c3e8efa297f6279cf286660513af7c2105c253d812089b90aed6b25537a3a
font_02_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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