Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f32e2d1fd7f5ef…

MALICIOUS

PDF

70.5 KB Created: 2021-09-20 19:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bc1352f05c28a546392dcc834a00da48 SHA-1: 9ac9c70030d52313d6e00dc1666f36a14649840a SHA-256: 90f32e2d1fd7f5ef333d7c8cc865e3d77283f8ae9a57ea75a391a6e3be94b21b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://prepearl.com/uploadsfile/lokomirobelinibobuzesugor.pdf In PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/81229953954.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/cf35e4fcd89ea6da9f8883b73f9bdf8d/64362166929.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/35831400113.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/29959797703.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b54859bf2f---76944823933.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210920233722.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/80999094760.pdfIn PDF document text
    • http://unsersohn.ch/images/file/newegek.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/83945122659.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/63593498844.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/cb860c59f2d09b94c4d23998dd36f19b/997624442.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/wetigizibuvixazok.pdfIn PDF document text
    • https://basisangka.com/contents/files/63697544286.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/19222210967.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/mkg8r9kpnfmroj7rsvdhnuk1q4/25828939419.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/76352206633.pdfIn PDF document text
    • https://nyig.com/files/file/80951487075.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/rivexorewaxusewidagesituj.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/kafexitazonenoloseloxol.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8bf1a7f743b93a54a4016db543660a92/35441836196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=glitch+gangstar+vegasPDF link annotation
    • 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_off0000b2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C2 10492 bytes
SHA-256: fa89453666f461980f5ad169da4a79285709feb8dbf7bc4f5cf96bcca8f86146
font_01_sfnt_off0000ca9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9B 16356 bytes
SHA-256: 322554a501f22d165caea696b4921240f4fb04c4fd99207bc1520a4c84056eae
font_02_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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