Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1d10509babe775…

MALICIOUS

PDF

69.0 KB Created: 2021-09-23 06:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d983ee95c7944063d0aa57e35ff02ab SHA-1: e93aa10291599a72c5a92415842e7ac5d46f65e9 SHA-256: fc1d10509babe775c0cdd4fa70e1e930f11ca4270e628e8dc274b3e60fd6aa6f
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic firings indicate a link farm designed to redirect users to potentially malicious PDF files. The embedded JavaScript likely facilitates the redirection or further exploitation, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://wsospice.org/uploads/userfiles/file/file/19805422561.pdf In PDF document text
    • http://ecoaga.com/documentos/file/dapesiledubawoxuvitabemu.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/nefufisakiros.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/92738864422.pdfIn PDF document text
    • https://shibbirs.com/media/files/99763164059.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/45620930985.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/nojawenunuwojokofe.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/nojisufufusa.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa79ea079---mepusu.pdfIn PDF document text
    • http://poiskvod.ru/images/file/70259960642.pdfIn PDF document text
    • http://khocabien.com/uploads/files/vebosadezezubazolawakoj.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/rewuvipivozep.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/wafebajamul.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/71962137162.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/ramusaje.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/66770824170.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/1nd8p1t3f8j8og0nqhvgraeu72/91745399095.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/40634471457.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/85741225132.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/felebigixepani.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/51139185783.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ep3jp55hgei91t9de27vhgsurn/18760834610.pdfIn PDF document text
    • http://riph.pl/userfiles/file/57703397390.pdfIn PDF document text
    • https://ntc-container.com/upload/files/wikalu.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/81685340909.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/wuvelaxuweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=4k+hd+wallpaper+download+for+androidPDF 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_off0000b19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AD 14672 bytes
SHA-256: e36d7da66eec3a56e74b9a5fec7ca90851e8550aa64820ebb2c6936cbc6e816e
font_02_sfnt_off0000ee8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 10488 bytes
SHA-256: 6eea38ee2a917fffa6f02d88459b1ea28f924c2826641810f48b4aa1cfe44382