Malicious PDF — malware analysis report

Static analysis result for SHA-256 499ea674f6960cb2…

MALICIOUS

PDF

87.6 KB Created: 2021-09-18 17:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ef151c981a7052c943254540f426149 SHA-1: f496f4c7f0e0cf12d1252f6131b6874cbeb61147 SHA-256: 499ea674f6960cb234930201ac121ce404e7784720d34ddbbf4871d4eaf67d18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also features numerous external URIs, including links to compromised WordPress uploads and link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=autocad+app+for+android+mobile PDF link annotation
    • http://favorit.pl/userfiles/file/kefoposizekibipo.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/bikiwaw.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/15842981338.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/90591427532.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140ce3e02356---97638582556.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/39584919604.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/16393341277.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613259b37b19f---81518972270.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/pezaxogojexas.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145618280825---22868330782.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/bevaben.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/wetama.pdfIn PDF document text
    • http://devison-matras.com/upload/file/74041279683.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/kuliw.pdfIn PDF document text
    • http://osayit.com/images/file/mikuwuzovuja.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/74797574982.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613def64383e3---91028310145.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/gobiwus.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/tijogamamejezaje.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/57541807129.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/8a70e613c360e645a77c1a8b685be4e3/puzaded.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/jopamaxamozirasudixovad.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/fajiliwowuje.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a658053850e32f9ae77d7f030df32c7c/mowufoganosafarawilanupi.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_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 18572 bytes
SHA-256: e18efba91ce0fa6297edb35836889e2d5d08dc1b45674d323f693b5977f8a10f
font_02_sfnt_off000137d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D6 10836 bytes
SHA-256: 813e3e6e1fd9f1e05a5b757aced314e834d159b58d1692d647ed4ead9a05bfaf

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