Malicious PDF — malware analysis report

Static analysis result for SHA-256 30762a6df1200dcd…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 01:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 976f191502bc5d9607344bdbdac309a4 SHA-1: 6710d5f2015bc8189daa08f84d26837dcfd0bd81 SHA-256: 30762a6df1200dcd0cfe91f364488b19da0edc02ebd7b0b38df11bd5580903b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or perform further malicious actions upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=short+stories+for+kids+pdf PDF link annotation
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16159d2b5---43444284641.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/65124557502.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/penuvaweg.pdfIn PDF document text
    • http://annabarons.lv/files/files/setejo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd686b31327---67331779016.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/41240651914.pdfIn PDF document text
    • http://dejede.com/userfiles/file/kobazosugikikinuk.pdfIn PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/mumegekafuk.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/balofet.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/gurobode.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5b4dd20449f05ceb86d24183dbd4631b/6030926936.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/t772mk2fqb5rsi2c6nt3r1affq/9141941818.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebde7a9aad---titifudalomejojilaxo.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/17341389659.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/zerogowon.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/47283526769.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/u1vjhnb7scqf53qk86v5kj8j82/94758766266.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/on2s1uqcenhpdk14lrolo6810j/rexemeru.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/bikakavopokepakutedo.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/87541667422.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/baa729a3f7ed384171e2f622185f17f4/178162785.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/xugimiwemolajokim.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e77e69aac---37651123381.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/savijule.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/vitugotisoga.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_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 10452 bytes
SHA-256: 80b8ce50a961981cfb4821e9edce8953b3936949057d9bbe5d41299b7d19d4c0
font_02_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 17380 bytes
SHA-256: bdd4ac9081bdaada2de307ddaf1d374e91d9b07e308d80a1f92ae388cc074c42

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