Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9888d2ee8c0245…

MALICIOUS

PDF

112.9 KB Created: 2021-05-27 02:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ad308ee025e8843b0cb4a996596adef5 SHA-1: a6acfe216fa9cc4fed3722d0d0d36e940eb220d1 SHA-256: 7a9888d2ee8c02450e40203f89ca0afbb80f6a0c6b46c3da7ad4023320bb263e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a link farm hosted on compromised WordPress sites, masquerading as a lure for 'Among Us unlock all skins ios'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload. The presence of embedded URLs and the nature of the link farm suggest an attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cd2f466c2---fesibinofivonowokazukaro.pdf In PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810345f0242---malexanoweg.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b4c367123e13cdb2d80a7d4aacdf23b8/37012893539.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/2c2dcbdd43891c883f8ac86b7d7ee138/65444908817.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da242d1804---44159941219.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778b1b192e2---2755272842.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acd48b81088---7775057426.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e288140e3e---xaxikejusiboxosawezomu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/627503dc21ab699b814b42a893fa5d86/39754476821.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/56094197074.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d85a6e652e1234e2d6e3b0fbb4fc5ff0/47145586105.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/jasajejux.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/ab8e22b0a955b39ba545f675806397c2/8277564908.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba795d90ae---vimakowuzuketobetu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609328b59393e---japerifinofilarewu.pdfIn PDF document text
    • https://noddy.nu/images/file/78168678680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=among+us+unlock+all+skins+iosPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17199 4760 bytes
SHA-256: e823174c3647df0aad9923297e18035297835e5397da9787565205ab1f266fb0
font_01_sfnt_off000181a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181A7 11280 bytes
SHA-256: 728b160f1b6fa2c8a4d315d0b631f371c257aba805448c1c013c6a31eade3aeb
font_02_sfnt_off0001a810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A810 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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