Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e16615e79c4f9fd…

MALICIOUS

PDF

88.1 KB Created: 2021-08-07 14:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43accd45e7f19d5da7247cac3499e301 SHA-1: f635f011cbc1c1783317a14985985481c8e3d2bb SHA-256: 0e16615e79c4f9fdaaf8a015242afa8e0289fa4cf3b45b08a6aec99cd59e843a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that lead to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://queure.ru/uplcv?utm_term=download+game+kick+the+buddy+2+mod+apk PDF link annotation
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b2b8139f6d82d720e0aeb31857f9ef95/manedexerotoromofes.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080780b5d3f6---38799629852.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607466693db20---devip.pdfIn PDF document text
    • https://luminex.pl/upload/file/51323767911.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gizomobevibabimuj.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/04c26fd3cd807cb04ada38aed70a6fdf/girixukok.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/6673c3c77887dce02fe64f616ebb87da/48467582401.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/nodubavupanasuwemixukuni.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/jvve642oncioq75bq3anv5lds4/kolakoxusidevemuv.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/1340850665.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ec4386539---62486593400.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///zebonogixiwuseruxa.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/figujamiboxijejanuzupon.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/tamepubudup.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/45631215332.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/nawof.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///54864296528.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/14545241689.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/15798741276.pdfIn PDF document text
    • http://sns.hu/_user/file/serupekominebuw.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/kuzuk.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/kewoputavat.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/takasanixapumevilumubixe.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/viromumise.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_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 11348 bytes
SHA-256: af6eb42bdf79cd969105f4839156bb4417bc2144062c6738b9d2d1a99be68c0c
font_01_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 17224 bytes
SHA-256: e017fe07dfec68920ee449c13437ea542c2ffa22f66b9fe4ab2750c9f3c7101e
font_02_sfnt_off000139ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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