Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dac5d05d8317df0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 00:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1887a3a642935deff77c8662df811f49 SHA-1: 5cdbecd4ff9f396ad04e9bcea3ff4b35c697a38d SHA-256: 3dac5d05d8317df05706e67001228d1fe4000610446c2cc93a06c18b7e863986
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content indicate it's likely part of a phishing or malware distribution scheme, potentially using embedded JavaScript to facilitate redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://klaaswester.nl/img/file/61349894029.pdf In PDF document text
    • http://hakasasi.id/userfiles/file/mumefikudosa.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/ralukigajabonikeburotok.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/78005808154.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f2ef78cc4---xunukidedorebixemi.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/kadizafeg.pdfIn PDF document text
    • https://nhatthiengroup.com/files/uploaded/files/tixor.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/63786264391.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/xezopuvafadexazadasidef.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/9664268369.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/amtfkp8rgkdp76434mgc7lt4k0/jaxefavotupuxuzu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21b29216c---93013723312.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/zinukeru.pdfIn PDF document text
    • http://519pf.com/userfiles/files/83617964712.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/daferufelasi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e8b1f238c---gudotukemepilalokojax.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/vudulepositekur.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/18715669038.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/vuwojasaremakodarizi.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/kijalitibatoveje.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/96989251064.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/46330517819.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/23191910265.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/2360474961.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/23155912290.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cnbrdi9k29clucgebde1nnhio2/35483484898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=track+and+field+motivationPDF 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_off0000dafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 17296 bytes
SHA-256: 7677b9d4a606206d5ebe69f0ec7ae233d43d90f9054cd39e1de8bee79fc855b1
font_01_sfnt_off000107fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 10588 bytes
SHA-256: 8fba15e63277067e5124049148312a55cd9688eb161a0c299feba6c5dfdbb9c9
font_02_sfnt_off0001202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.