Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ec2773363ce231…

MALICIOUS

PDF

76.3 KB Created: 2021-09-22 09:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 686c51f9e0f901b9b0408d6c85751b3a SHA-1: 849285f29f3834c1aee05f8463d31e83659ad9c8 SHA-256: a4ec2773363ce231dab768c0ac12d234643212a85e49f32ec4bc27aec84ba8d7
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or exploits a vulnerability to execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://studiotecnicodambra.eu/userfiles/files/76354214080.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e1c31d76009556503e8d8a932a1c09b6/80341168196.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/8084946837.pdfIn PDF document text
    • http://pedraferro.com/files/files/bisexozoveni.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jchis5htql2va0k7j3ct46hrek/14792061357.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/l5qvfsg1jjnuonddsnbgp4me47/wonupaxojuni.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/99736444113.pdfIn PDF document text
    • http://lex.tj/img/file/82067943601.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/74072458046.pdfIn PDF document text
    • https://superchills.com/userfiles/file/vujesamoverafepim.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/wizogidepa.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210914172244.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rifisuxobitavenevubo.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/22798296871.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/josafumolifisotimaze.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/gijikasagunudiz.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210910101249.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/bimudikapo.pdfIn PDF document text
    • http://standardamulet.com/files/files/kurasoxevativuzozowaxafo.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/27065797612.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380c4e6ec83---18821441756.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/jivoxabofuluzu.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/sasokizizirizinibujunenet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=compliments+that+start+with+the+letter+rPDF 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_off0000c629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC629 17468 bytes
SHA-256: c7de1fdeb2af06c315936d5735b2f4ba949e3b0f8016a44e351aa5d5cef5de2a
font_01_sfnt_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 10636 bytes
SHA-256: e4bcbf475e9970c6f45c4fbbf3b69729a16fd7d6fde855551f36ee857e7d5ac6

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