Malicious PDF — malware analysis report

Static analysis result for SHA-256 23272a05851bc19d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 18:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68766715683c7d952e98b539d8ebdcb4 SHA-1: 2868f230df3e8408e95c59abb5a3af45a91c4739 SHA-256: 23272a05851bc19da9077b72f4937c79a21af10e82420437cf1ecd79588f3561
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=tracing+letter+p+worksheets PDF link annotation
    • https://newchat.xyz/js/ckfinder/userfiles/files/sekujenekifurexazixibin.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/62859631920.pdfIn PDF document text
    • http://apart1day.ru/file/76629194895.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202108282107158067.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/89731905701.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/rdcb2u3l9uvm726s5dl1lb8dvv/96557465818.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/31171629221.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/70177092096.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/14433704250.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ou4p4ojar71g5e826fud6u23r2/76212884226.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160829dc071e04---fezifad.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/gerurirutosexiteja.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093d15943a22---diwatesaroduk.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/xabimaxoguku.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/63654466285.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/n7i2tk9olrngu3hrkc0tsq1akd/89037391684.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/76319488724.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/riwuloxedovizonigegi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c9fc9cc41---leluro.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/4621641390.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/jagedotov.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_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE21 17712 bytes
SHA-256: a013ad544b349a3a89a14ff32ebc1edb2ec75298e69d8fae54e9c3586dc8bc7f
font_02_sfnt_off00012bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 10796 bytes
SHA-256: b7eac90bc619538192e567c58985ac315b5785b1121d7c77468c9d11a4b47e2c