Malicious PDF — malware analysis report

Static analysis result for SHA-256 371ee9776ae38e92…

MALICIOUS

PDF

69.6 KB Created: 2021-09-19 09:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e75dd15d9755e42a949281af0262893 SHA-1: 38303ace88747c94c38addb50205504c75e4fb08 SHA-256: 371ee9776ae38e92acbec72e4b23fedfcd3b0f4ce5a8d44e02d999ec5365212c
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://medvor.ru/uplcv?utm_term=lock+screen+android+java PDF link annotation
    • http://cl-metalparts.com/d/files/81542029435.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/67081254663.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/jimaxojodagubedawugemaje.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/37682889668.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/79754550714.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/woxemasarurum.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/46169294863.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/volux.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/97797766452.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/15671723876.pdfIn PDF document text
    • https://fishuntpesca.it/file/netezevatefukatati.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/maviwejefazogif.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380df759384---29101458726.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/13693391519.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb705fbe3---43577141370.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/37763326260.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/tuzesusopidumefegemig.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/57048212043.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/85278689192.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/lemutatuxipu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a55630f02---36799089393.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/wonelujebomiwepup.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_off0000b374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB86 15064 bytes
SHA-256: 0127781f190eb2804774d990fdc3e73ab6582de6867000d4acb70841ccaa2e9b
font_02_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 10464 bytes
SHA-256: 88a74a93a15182028ce16346e536c503acaa1158d244786bb5f99368805c04fb

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