Malicious PDF — malware analysis report

Static analysis result for SHA-256 637f8706695018ce…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 23:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e8348ac4ef728d345e8678ebbf0f46f SHA-1: 55572deabebb9dfc69339ddfdf05e5f759cc52a5 SHA-256: 637f8706695018cef6c407c525c36f18425d62bf9b0f83272d3e21ff66879d73
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=delete+pattern+lock+android PDF link annotation
    • http://baobianhkhang.com/upload/files/97305187953.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/91265901273.pdfIn PDF document text
    • http://labsshop.com/d/files/5072640289.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/mizowugerasubofanekalevu.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/gedajisoxitebimavusixedeg.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/26483296245.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/16869408132.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210901051607043.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/79331248331.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/94851599716.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/raved.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136928e0768e---zivijubixuwubufokoxi.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/34978434619.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/81970685350.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/lowiwifawe.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/benubidat.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad50c3e691---65516271139.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c9dd3ec23d4035cd826635971ff86ea4/petelak.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/14595417420.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e26dba08b2---xomalofiza.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbca48068a---lemavaso.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/wewikotub.pdfIn PDF document text
    • https://inarsindbari.org/uploads/saxevopoda.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba94ee335---86413694467.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ae0d4292---98391627473.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_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 17892 bytes
SHA-256: 9323d9f6f5385fab9bb4e5f797aa2fdcf138d2e0688059095dd7619608fb8745
font_02_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 10432 bytes
SHA-256: d00f8eed80d2e4a6dfb926818526c966ed2cd1d6e884a29ed0f3b28a01da096a

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