Malicious PDF — malware analysis report

Static analysis result for SHA-256 612157c512d7e8d6…

MALICIOUS

PDF

76.9 KB Created: 2021-09-23 17:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ec50780d2ed88845233df398f217ebf SHA-1: 1b7585de2610eea80600ef2107be423cafcc9e64 SHA-256: 612157c512d7e8d6a286de30b92a1f3bf6215203124c47e9faf286a95066721b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features numerous links to compromised websites, indicating an attempt to host or distribute malicious content. The presence of JavaScript suggests an intent to execute code, likely to download and run a second-stage payload or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/cf7b220f3bcd86d7e30f70357604501c.pdf In PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/dinalinomedami.pdfIn PDF document text
    • http://tayles.com/uploaded/xudizuripefanesariravisa.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141da5bc6e35---jubin.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210905103255.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/julasugulejuwosop.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tobebenuwokiketelebep.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210911051054.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/94863209468.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/78553999566.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/sorikopodefodiforakesuv.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/fesewuputukononamamesuvu.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/57857057943.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/20109819651.pdfIn PDF document text
    • http://idevoz.rs/files/potisupasep.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/jebilajutoludawidum.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/biwiwenugowuj.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307357612ae---43423449619.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/9861317908.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20210917125505.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/wotinukejavofi.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/defuvenikamo.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/57987153614.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ef9a7904d8e194609eb36e340b0c21bf/pobajupi.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/mesavewe.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/34035916281.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/vomifekoduvewagex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=chris+claremont+charactersPDF 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_off0000c799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC799 10524 bytes
SHA-256: 5291fac47844796f2d1421a823bcd8ff51abec465d805c7ae89e0ae4b56f5084
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 17940 bytes
SHA-256: 60854f971f4d1bc20f9c13868c0fbc4c03affa7412d474d22e0f73869ee4bb20
font_02_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.