Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bc22b8d2c3e0a8…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 11:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 644b58e352117b9330acce8161bbc88f SHA-1: 7cc184ab61d10035b0f0be985971812fe58d8eca SHA-256: d1bc22b8d2c3e0a81024704460771fbaf817a4408e6ba2782c84cac95fa54236
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that the document is designed as a link farm, likely to obscure the true destination and distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://status-go.net/gfx/userfiles/files/38593582380.pdf In PDF document text
    • https://paradigma.bg/uf/file/jezepotufulawiminad.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/34496604284.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/lenilanoliruwirugitujobe.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/24308032956.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/dorawusewugebonen.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/4399326317.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/40539892405.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/pefuvuzuvenovarajisonupo.pdfIn PDF document text
    • https://umartravel.com/files/97850390159.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/23430071759.pdfIn PDF document text
    • http://superazs.ru/images/news/file/4363507258.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/68054022917.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/55254218667.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda402bacc---29155877757.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613581b4f0972---femitiv.pdfIn PDF document text
    • http://acelybio.com/upload/files/45204614414.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/tixux.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/57708275390.pdfIn PDF document text
    • https://777mto.com/contents/files/xowoju.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136762ddde56---vebevetavedupofola.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/82546157388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=suicide+squad+watch+nowPDF 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_off0000acb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB0 10728 bytes
SHA-256: 740a017264d734d6c3e5259160a9ecab2cba652d5a3985ba3725d9be1011eeab
font_01_sfnt_off0000c528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 16044 bytes
SHA-256: cb82d6ade73e1f136b697192d8d323f84895c7cc8a705eb0afe63f7addd7e64d

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