Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aee9af7eb4091b4…

MALICIOUS

PDF

86.2 KB Created: 2021-09-08 00:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abbe152fdd188e5e9959c4c75613d243 SHA-1: 9d40f20455c22860f4c483be49613bfc17b8fd7b SHA-256: 4aee9af7eb4091b400abb476f072ef1bb3909ae54fc3ac4463cfcd54746d1e73
156 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised WordPress installations. This suggests a phishing or malware distribution scheme, where users are lured to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ml43m0v6mr8bff9cskjdsrfscs/dulovawanugav.pdf In PDF document text
    • http://kaies.net/upfiles/file/37234038066.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f817b292---jimebakamepizupose.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/fakub.pdfIn PDF document text
    • http://besteva.com/upload/files/21379365153.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2211c513---nediwozenibewagaw.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/rakidewonodatalejuxa.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/13911857299.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/88344531021.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086706f74d24---22958504768.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/dorusizeviji.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fd3b227d0c05742e6f5544ef98aef738/zaviwivexilob.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160879a626b3c4---979582454.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2b373a17945e3a3996d0d38eb14af87/16852375558.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/56903819049.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161282ee72783e---ranimude.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/u1j1i20kk18638agj03djqqcsa/mekexotuvifu.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/lopokomidolikowaxozesew.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16126bae8f37e3---tepevuwowoputewoneb.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/loporugugonilazef.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/37175481763.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/837d79fa17eb6719df5d865466393661/26352448070.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990aa38c788---6164546780.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/xagajawajesolusilisaneb.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce15b02c1---71123510542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=arbitration+act+amendment+2015+pdfPDF 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_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 18028 bytes
SHA-256: b2d9bce9bd7f80d78ce1d92bee6f0d0d7aceeecd38d3caa911a7e9006bb37993
font_02_sfnt_off0001312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 11116 bytes
SHA-256: 1b714dc45894a27aa5ae17690e64054d3c5003260ffd6a2748a3de130d13ff8e

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