Malicious PDF — malware analysis report

Static analysis result for SHA-256 972b93af8089fba4…

MALICIOUS

PDF

92.1 KB Created: 2021-07-13 16:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 28c7995bdc8720bf82e0af092ab700c3 SHA-1: 0cf3b4f3d324b97ea407621a4c31a0b90d61580c SHA-256: 972b93af8089fba4c213189fe8dcd6226d8a51e52cff8130449d5e8e40a4c563
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. These links likely serve as a distribution point for further malicious payloads, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160782ac3d03ed---rupuresojoved.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d86fa565ff849b904e86e0954861f1d8/wedewefefesulos.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/vumafof.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/detatemijinifo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/689fcaff85de677920cdab67f38197b9/rakofujawesezudusatevek.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1625356591_7d97a40bdc.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6d5822f31d62de5aca9c99e3cd7b9b9b/91940412075.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/denux.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/25e28785c41a702575b8dc08032616f4/7193976030.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bb00ae46f---jamobipalekid.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/87048260762.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/genipupomosobobotuwini.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/radusigofejewulizuri.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/kopivo.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/23304491341.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/da1b1951b08ca4a368107127bd4350db/zazixe.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7bdcc71dd---29634185708.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/buxajavaze.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b4de9c9127e97ab5a902c3ebab4c64aa/legarerepetuxasomaken.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/barafe.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf41e0a305---wifuvubobesolajinar.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e846008f0b6e0f052b55ddd6550f720b/fipaw.pdfIn PDF document text
    • https://dineflon.com//files/71656982476.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/37186974516.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/zoxukixajemutesusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=verse+put+on+the+full+armor+of+godPDF 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_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 17364 bytes
SHA-256: 0e0ec09967b6020cd90162423b06a9061ccefbdf235bcd72998e6669ea694381
font_01_sfnt_off000131f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F3 10924 bytes
SHA-256: 46d0a01dcc6916a4d2fdf807cd4f28361970dc84cb13fcfaa544943c953f6b4e
font_02_sfnt_off00014ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1