Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1af22ed5e1930b…

MALICIOUS

PDF

72.8 KB Created: 2021-10-01 09:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bbbb9f7b3113cdae669038811049a1fd SHA-1: 5d19bedd2f61c3c9481eee8f58a4c08fc3131dcd SHA-256: ac1af22ed5e1930b879c64e8a2c23fe18aa213796b3ff726dfa02727212c0d78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=mortal+kombat+9+movie PDF link annotation
    • http://perilatomsk.ru/ckfinder/userfiles/files/29022558280.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1add9f9f0---povitapexikux.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/koloxeresinuxapawi.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/6934085632.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/64316352099.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/budelazexijajewogo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8e646523c---20644084970.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/11423981083.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/47252148050.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/3774963421.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/36594415951.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/zetomoburujemozis.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090414064573499.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e00270c5169afd991737a51c2da1361b/98265676575.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/95573456481.pdfIn PDF document text
    • http://glassick.com/userfiles/file/dimir.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/211001020846297831s7sxxe.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/zujowazejejiviz.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/zerinowuxokogi.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130370c9afea---39979922788.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210910165813.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142773882f2a---26819031104.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/ratavejanije.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_off0000b842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD054 17764 bytes
SHA-256: 3d5443274711be9640c3ca86f088053ae0347a1c266bf8b1e6c3cd7762d2145c
font_02_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 10456 bytes
SHA-256: 7550ec5d666088e6a2c4c854be4ead0711465f6619b8bade668394d29262871a

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