Malicious PDF — malware analysis report

Static analysis result for SHA-256 815853bf8f3ab557…

MALICIOUS

PDF

65.1 KB Created: 2021-10-01 01:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a2ba470075c6214650171c48216fbdce SHA-1: 1ee07cffb745831d478967ba140c69c4b43af85a SHA-256: 815853bf8f3ab557ac22ce43da3daf9afb682bf37302ab8f4283565a475860c5
132 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. It also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ClamAV detection and heuristic firings strongly indicate a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

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.
  • 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
  • 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://cructi.ru/uplcv?utm_term=toy+defense+mod+apk PDF link annotation
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/simeneturukanofaxomaxaze.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/69485369711.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o3d8memk14s7e3c05v7o7kn1mi/nikuwigu.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/58408353827.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/25747032623.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/ruwukuzananasibedupagoj.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/54h8sv4eifd362ord58uk53nv3/papolemelonivuxokavew.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8242df68b---98010381846.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/99911409757.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f9aaecf08---toviguduwunud.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/16825814068.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/89956121364.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/jisonixaxuke.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/85133823427.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/54740556730.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/vitajur.pdfIn PDF document text
    • http://matras-devison.com/upload/file/fowipefojigusodutag.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/12060349073.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/79235951588.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/6358690997.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/zebike.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/57958197548.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/lidozerasapibos.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAC 10492 bytes
SHA-256: fbf9643fa4392444f9d3dbcc48c6349cd7661409e4cfa6980835724b5b61b75b

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