Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fd1f80ab1aaee9…

MALICIOUS

PDF

82.1 KB Created: 2021-08-21 07:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d2e0fb9dfb4bb8e59c87fe8ce3206f3 SHA-1: 9790f0cac9746d15d7bd45dd2bb1e91abb2d3a56 SHA-256: 04fd1f80ab1aaee996ddcd90b64f16ed510da03762bf1d3b393e1b300f29bcee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable domains, likely for SEO poisoning or to host further malicious content. No scripts were extracted, but the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ip-kamera-rendszer.hu/ckfinder/userfiles/files/61347770660.pdf In PDF document text
    • https://stotex.rs//files/27012331957.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/7019164098.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af7bdfd812c---19929768119.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/nujera.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f325b1172b2---44451616919.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/nolekenejazudofabipobixu.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/jorodijeturisebuwomuteje.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/lilopepifi.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/sawogifiburumiravir.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/zejexasi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d333fd251e---jobosodix.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2910fc36---78971734058.pdfIn PDF document text
    • http://taigesw.com/upload/files/genojuduxiru.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/lesolofowasuvurote.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/razitetutamaridurafagop.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/nevig.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaa80694aa---1057850861.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210813194859.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a86328365---78746960071.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e60ad9911e---kudovanuxiseguxasibanab.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/93858398767.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa6eab27a---17827550785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+cheat+engine+for+android+rootPDF 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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 16548 bytes
SHA-256: a04b036a37fec0c14e84dc48fa14bbcae01c156cfdd59c6b2682ee7d3001f562
font_01_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 10764 bytes
SHA-256: a9c6f80ad180ef9171e7e07639a53c2290148093c9691cdb8a709e18c4f6b48e