Malicious PDF — malware analysis report

Static analysis result for SHA-256 f521905e467426aa…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 19:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed8fb8b3bdd8343a9e60648c8bf44218 SHA-1: d6b0e51bbdfbb7b54965bc869e66b39241f6dbda SHA-256: f521905e467426aac38fad80d023e1df4a076d66ac5799b817fcc9d01a874456
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=make+your+own+neural+network+pdf PDF link annotation
    • http://rotarycochinharbour.org/ci/userfiles/files/82178110643.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/21896648027.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/xujeperume.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e443f2296a283e48cd387a1828687ce2/latozifuzagono.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/soborapuxixu.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///85909774147.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/widevirurived.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/baxenopisidawol.pdfIn PDF document text
    • http://canvangdientu.com/images/file/30265868535.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/nedewesudixunumolusiz.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/vizizuzagobunov.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/mimefizudeta.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3dca59848---49492131212.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/40216861132.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/zavasipenebudi.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/57721714124.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/miririlolozozije.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/85093941435.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/zifanulusokilevutodobajax.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7759d8fe1---rutarexifazixiso.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/jaxexef.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/gewej.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_off0000bb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB28 10616 bytes
SHA-256: 35e90c1b8f0882c6263ff884682f827189b56871eac65aa8031c5b33f6123ce6
font_01_sfnt_off0000d3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 17340 bytes
SHA-256: 8142550076e08d7ed19caecae610c5b24c08e26c9e04de9bdeea16a478fe5407

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