Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4079b68b09138df…

MALICIOUS

PDF

81.1 KB Created: 2021-06-28 09:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 98914d48eb35105c3d40c2d2098b0250 SHA-1: adb98b28038bdf856f51b7f8f5e06087d7e723a5 SHA-256: e4079b68b09138df97b3b00534c6e828d825f752d1a4ccc6786ac1c48896e085
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it's intended to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/03b60e1e9ba94637bdbaebceb5dbf9a4/51857327105.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acacf67801f---pelititejovuxijidewekuje.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3a65911e---84914153400.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/45979360853.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/23311117281.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/63235134676.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/28828052471.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092825b199eb---funipuzuzosugagut.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ab0337c49---lozojotozusexevenadub.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cef23a7bb---42217051741.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/94012053693.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b6c68e68be9ccc7786f3756c7fc2b829/40474438949.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaecfa5d6f---72775975505.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/92e105d7a629098ff853a6f9857cefc5/11214485946.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc361358325---ladararewo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/v9tkbujiovel0lo4arsmvgtdj2/popuruguzid.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/80350120856.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ci3r2600lhas0kn5102nepsiq6/57752925741.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/45325963002.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d47d55226---vabegowaregodaximiraze.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e78e8d29---72553308638.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/bobatexabi.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/24904174764.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/hsst0i0n76ivf5e1c2rraqvuh0/subusaxuranen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=principles+of+agronomy+by+reddy+and+reddy+pdf+downloadPDF 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_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 16440 bytes
SHA-256: a9a01058f8395287e53085cc488059530a9726f3413a7e3b5cb2df8331d837dd
font_01_sfnt_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 11208 bytes
SHA-256: a567d64f5d4e022e313036d3b929949cf6689880bd159566c249809e7fbc8375
font_02_sfnt_off00011ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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