Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b7a436495aa3d6…

MALICIOUS

PDF

73.0 KB Created: 2021-09-28 08:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6516a61eaf47625bfdfb6ae2deb1108d SHA-1: f2bcbda42dd8354acf8e742c0096a1e7237de7ff SHA-256: a0b7a436495aa3d6c159c0dcfdeae127edfc5fb819816b9dd2825c5971bd0d68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://adtw1.com/ckfinder/userfiles/files/weverupubawotovitobeniz.pdf In PDF document text
    • http://101-games.ru/images/uploads/files/bixabefefulawutot.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/92490908068.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/jakevadujolazonep.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/zuziw.pdfIn PDF document text
    • http://519pf.com/userfiles/files/22778038787.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/68088864708.pdfIn PDF document text
    • http://huefpdf.org/upload/file/sufewoxa.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/jedujeravajadujot.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/56881487694.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/p9ogqvht8kj1dmru4jfhtpea7p/zetibazumogaritet.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/15255829763.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/33da50a313a058e1c4ab4eca466f7469/rudim.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/kkcctacuib8rv09fjj7bkvrcqp/zasalaxikuximasasatuzaxa.pdfIn PDF document text
    • http://pieseautocomenzi.ro/userfiles/file/70662125102.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/5783656884.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/sagimobasuzijigekegeta.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ddf3fe677e3bdb484e8eac9232666b18/776225659.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/vaxogo.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/njpqfsc61cic4sbcm7pibffm93/fawavekajufejojaxebopif.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/49696414708.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/60958266862.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5d563fa40---sigufamakalepowabig.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/xogulejakupubo.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/mapuvaposodezepab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=conjuring+2+full+movie+download+tamilPDF 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_off0000b750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB750 11064 bytes
SHA-256: 4588869bfb4d6dfd9b91b176b154826487156c56bd2a15368ef39bd72228a46a
font_01_sfnt_off0000d0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 17668 bytes
SHA-256: 2ca80c0267319de98a5ee0b67aca13613dee5d988c85dc885afd26cafa3aa2e4
font_02_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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