Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8968bf2722efb5e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 22:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 12c733840be56b7a57334ac74a109181 SHA-1: 52af7b8ffcfcb66fbb86acd7960aae31641af529 SHA-256: a8968bf2722efb5e596e496ea66851e32a8239397cfdc5b9689eaf86a8defa3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The document also features a large number of external links, many of which point to compromised websites or disposable hosting, suggesting an attempt to redirect users to phishing pages or download malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=game+hacker+app+download+apk PDF link annotation
    • http://hyosangjo.com/userfiles/file/20210912015451.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/60541758253.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/13ff1a68f374e20376455688242d741d/kesawojavubovisubopojin.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/19139506635.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/453b0ac39cd2c94a60089ed199494bd1/30834318800.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/fozeronomigagofel.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/pivumupumeduxowikavixum.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210921023141.pdfIn PDF document text
    • http://idroter.org/userfiles/files/kamajeduvijaxamego.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/wesafidivirawem.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210901235327510042lsb2b.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/74592325262.pdfIn PDF document text
    • https://seger.cz/userfiles/file/66094109249.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/xexojun.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/od7ruf8k8qsfck7if92no01dg5/91214745144.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/mudikipujabawejizutez.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/72258991635.pdfIn PDF document text
    • http://modero.vn/upload/files/90756238907.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/84596701020.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/n97v4u5g3jjb1mm55ocadqs543/basovisalikumoro.pdfIn PDF document text
    • https://gtpoznan.pl/cms/files/file/tubunuxefababom.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/josejerubividuredev.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/56590525582.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/43773579769.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_off0000b25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25A 15488 bytes
SHA-256: 41401913b875daf0fb9dc0ba66903acf65948692b2a1071fc4f02422eb692e07
font_01_sfnt_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 10640 bytes
SHA-256: 5d93d53624aabe4d71461755381b2c29bd1637a6beebb47e2a40078d8b7bb678