Malicious PDF — malware analysis report

Static analysis result for SHA-256 787930c27461f10b…

MALICIOUS

PDF

96.4 KB Created: 2021-08-15 19:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 4617b0159987bfc34a6521c5cabda9c4 SHA-1: f04210a114d7ecce6a433f9d7f26984bc2c2b52b SHA-256: 787930c27461f10bc6e30721b760ca9f5db8886d37a9cc6a4163cb04dc5f4b24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://masukpt2.com/contents//files/22165058040.pdf In PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/nefimifuf.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/foxisixaxidapuwipanuwo.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/relmj6apt8b5c6102aofr5lh80/tarapexadoraji.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57886088d---jagedalenodegizavafixo.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/bgvk774jt1vime21i7d3ule74r/zaxegolibavalitosiv.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/d2a7f7a1fcfecd5d1bad0a09493b6169/81806216041.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717d9733ff2---wuzog.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/52743774797.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91956a9042---3962581802.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf57b26523---93802703751.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/49096975866.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dead09dcd2---gedoruzi.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/79739786650.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a0845f67---pupufurakavurawovegegew.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d465951b5ff---9743641813.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81ba2e733---92426995546.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5a884680a---555076259.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/543f5a3739cc73f55d8873f830751ab5/gumelazasubulonekedo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b42762a6c6f---44867693069.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/79894945065.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/vizusopegagizuv.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/1225067049.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///93511156854.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d273d61ff2c---31519438067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fomema+appeal+form+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012c78.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12C78 19872 bytes
SHA-256: 8c087fec2b40b249aba01a2d5c15d9818f49cedcc13adfcdc8d24ac298014ec5
font_00_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 15700 bytes
SHA-256: a0a0eee323840d1436f32a31f9e39d71918fb3c8d59c4c73b93831f06e39cbac
font_01_sfnt_off000115c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 10176 bytes
SHA-256: 72168171b3532e5ffdd4f024ad987b596781dbf7b7f4b71e5c9d0270fd1d20f7
font_03_sfnt_off00014e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16638 3136 bytes
SHA-256: e0c48181e633a2826b6c611f075df949b39115ef753aef4e2bd333754fbc5986