Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a10908d9d644bb8…

MALICIOUS

PDF

72.2 KB Created: 2021-09-17 20:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2d06ea60f35cef90be062643353c832 SHA-1: 67c512fab748783fd2fa4ad59661911b5b03c61d SHA-256: 5a10908d9d644bb876060914a00a56517b4cd975d7949979b62c0b9a55591e69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to potentially compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The presence of embedded JavaScript further supports the malicious intent, likely to facilitate the redirection or exploit vulnerabilities. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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 https://traveletrust.com/basefile/traveletrustcom/files/99277491197.pdf In PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0bff2ed5---59630282425.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631357970.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/serejokavaw.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/2689811310.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/52312889469.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/wejekagovopoxafude.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/94183924297.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/betizinaziw.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/39238070193.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613360504c173---1716833089.pdfIn PDF document text
    • http://msiutilities.biz/documents/15565952717.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/58592744019.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/10573143301.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/lmc8a0tihpkhjc60ud8rr3pvsh/nesuwemajuwibexeb.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/tevigazego.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/xebifokuxosofedamabiwavo.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e0b4be3e---8303829873.pdfIn PDF document text
    • http://marymo.ru/uploads/files/nugogulu.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/zotemowanosupuwisogoni.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/5979574557.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/jewow.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/vopukebodipura.pdfIn PDF document text
    • https://jurad.eu/files/file/tikudesaruxokafuwibumu.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/70613891869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=2+line+shayari+romanticPDF 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_off0000b7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A7 10632 bytes
SHA-256: 086ae4ec98bf2d090caeb9408821fabdf79a9092c785bb109eb8a59ce52bddeb
font_01_sfnt_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 16880 bytes
SHA-256: a3670e5231fa75765d3d320570148f9d4d58c6adf6871d23cb8c1eca2e57aee2
font_02_sfnt_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1