Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ddc592b46de1b5b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 14:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a0f336177f7c8af9bedd936d4dfe0e4 SHA-1: 015a37c61074a932ed5abeed637a1af6a76fc8f6 SHA-256: 4ddc592b46de1b5bf0bc4c572228314afabf2d0a7e4da01b50dede69a22e53dc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a lure to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160853df062d92---64909974871.pdf In PDF document text
    • http://aybar-gallery.com/userfiles/files/86393590485.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/luxedivatige.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3f433cedb9b80ed49e4e15f2fcceb08a/20320329309.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/93473955479.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8624fbb6c2fd8ef65a9949e84d79c903/42034928892.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9008592ed---duzizejofupegokize.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/renofitimufoxape.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/limufop.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/fuzigiwunidoxiregin.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/digewoxilepadugulawimalu.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/rudejojos.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/wunufu.pdfIn PDF document text
    • http://domainecomps.com/documents/files/vitak.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/m9d00gl8lfrraagh0vqs8asa7l/loxefura.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/73651392323.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161268bce1d584---18176651048.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba10db7dd1---woxigerefaz.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160861ea808ba4---wezuzabadeko.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/mabalemarawirigilorew.pdfIn PDF document text
    • https://onlinendttraining.com/files/vafotawoxav.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/ravojiji.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/cb744f2d0c9c76b6c6414bddd9e1668e/raviteropejazuwowuz.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/89a06f06f3d2b5b82a1ddc030530b588/dulegixabajabovugog.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/jilanuvolilutakezonegodan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=livro+pnf+facilita%C3%A7%C3%A3o+neuromuscular+proprioceptiva+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_off0000c4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CB 11368 bytes
SHA-256: c45c05e962dcb6b0acee591a875d67cf9f46877518f61955fe5d6a619f498c6f
font_01_sfnt_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 17376 bytes
SHA-256: 6800084b50c2d421eab7f15b644c8e72dc98ca31bec71dd2a9f482a93e640290