Malicious PDF — malware analysis report

Static analysis result for SHA-256 c347a4e2b8d60e42…

MALICIOUS

PDF

113.5 KB Created: 2021-08-12 12:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 001d2940a753356740c3d1a6b382e970 SHA-1: 0e475eb9a7f5b797c719b48691a2273c4a386109 SHA-256: c347a4e2b8d60e42da36e4e7a3fbd4dc7fb2afacfbb3bf21a9155093180176b7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9330

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://ibeguiristain.com/userfiles/files/94316318933.pdf In PDF document text
    • http://smenergy.kr/uploaded/file/126004654060ffb4bca3fcf.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/301028521363.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/54976216316.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/pevotovexogapemude.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60ECABE3EEEAE.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d4e5b57e8---19642114697.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/vibosorizajaputowug.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af77a97e105---vatasomabefarugid.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1af948ffedd3adf6e3f164c4de239d1a/goxuz.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608727cc3fac0---7720683721.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/gajisu.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/pabigemi.pdfIn PDF document text
    • https://aspirans.com/files/file/kumumozak.pdfIn PDF document text
    • https://iword.de/userfiles/file/rupilefigajifebikopi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608344c22a627---sitagizatotid.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/c0ed60fca6add8319593b4563b725441/41985986490.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cb6e6b8cd---domefanirawibodezusu.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/21055584771.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507040654978886.pdfIn PDF document text
    • http://geodez.com/pliki/file/86579585800.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/cd9r1ehss506hvtgdtefluvk4l/zaketukapesunaloz.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/84700465540.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbca34b117---2631682403.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/h5509t9ffeie9guhrut450nsns/49470803635.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/bikiboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+replace+keurig+2.0+k200+water+filterPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB2 16500 bytes
SHA-256: ca709e3d79a0e46599ba862859f6181a376d5adebf35f668e81448009b52a0fb
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 43952 bytes
SHA-256: 01c91d03935f1243a8a8053e1e78c0cb0f6e45eac0112cfdfbe0fce641eb5b8f
font_02_sfnt_off00016d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D75 10960 bytes
SHA-256: 7d3f36a964302b4a00592ca43159bc6baa710411974c2ea11334c2f36e7a8d6c
font_03_sfnt_off00018715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00019f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F26 16220 bytes
SHA-256: 132f05ce40ac9038317ee37a5988612cc6d75431eb485d801d5d4d5d0d706cfe

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