Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d000d13bf20150a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 07:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea38f311f698fac725c797f38d942231 SHA-1: 37a61526c96174f50aff07ed99faf72b41331563 SHA-256: 6d000d13bf20150a6534acf91b1b1b6394db779a9a58c09816fabad91a1beb98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, containing numerous URLs that point to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple distinct hosts and the use of disposable hosting reinforce the malicious nature of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/537a49af90a054d456fa6f64fb25a626/34975227625.pdf In PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d92a827c3759d1e69658debaaf15aa7/45610894382.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/pamewakiwaruzepad.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/sezelenufisan.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079209a4b041---79024946831.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612177e9060c2---gifafavinatumalofafel.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/ruvapabejuximijukowefiti.pdfIn PDF document text
    • https://people11people.gr/uploads/File/24175647280.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/kobuvamoligaz.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/44763748040.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/lifodusipinot.pdfIn PDF document text
    • https://fototipia.hu/files/files/45049041130.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9830c19f8---88645593272.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/336eeb89c5e414cf66f203804fb90f0f/18346857404.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/mabiludejovemaxesilo.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/36366857424.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/padagagunowurafomewosox.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/46040518074.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/8395552484.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/fbe031cce6c448e9f561e9b1fbfc8c30/pemalase.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/36475194321.pdfIn PDF document text
    • http://ciskmv.com/css/file/gedejawume.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/wasasatal.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/6345086000.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/mesen.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/dizimone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=indus+valley+civilization+art+and+architecture+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD487 11008 bytes
SHA-256: ddc794f25977b0aa9fdcf8195275be8eb0c6a7df4f608ffb864233419e3d5e94
font_01_sfnt_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 17780 bytes
SHA-256: 9ca0b121b5fcb3815da763f92b86b68159ba8a4b02997b26a6248bfde80d57b4
font_02_sfnt_off00011bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1