Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff65e3ac90e34d31…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 15:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96294892f6b499d624da629281061b60 SHA-1: ce3dbd80673c435f4965866220e5d5b12da72687 SHA-256: ff65e3ac90e34d319add76e9f7924c28aa6e6579a84062dd70014f20edcd460c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, further supporting a phishing or malware distribution scheme. The presence of JavaScript and the nature of the links suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16136877546a04---45813202578.pdf In PDF document text
    • http://www.39koratmachinery.com/file_upload/files/luvawiliralir.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/fevabesofawidurow.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/78454081048.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/vuwawewusutitebexikitu.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/12301759358.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342c99a5633---90438754484.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/fuxewu.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/99061950655.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/jasisomotosinemepunu.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/61705234532.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/25767280601.pdfIn PDF document text
    • https://wittnebel.dk/file/manetora.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/parimadule.pdfIn PDF document text
    • http://arucax.am/user_images/file/bojavepejeluxu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8f9c2206---53240483319.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/43444276076.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/fupase.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/bavibepiwobuxefaje.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/botivasezilulasaja.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/47075532642.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/sivudagotapifexuzatak.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb71207a0b---rovoditiv.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/nofivigunid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kingroot+latest+version+downloadPDF 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_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 17932 bytes
SHA-256: 687764720ad7d3b054b045212ba5536442f12d56a49e4ba4e9e1ec3ddfffd996
font_02_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 10568 bytes
SHA-256: c73a76b156411d23f1bc801d4d310723a822b25936e66026166f934326aa09a3

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