Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c46bf2a7b710b9…

MALICIOUS

PDF

78.9 KB Created: 2021-09-14 03:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66d2ecc3449cf839ac357cd6737bb22c SHA-1: 34d768894a99e02657cf8a954027792753abb334 SHA-256: a5c46bf2a7b710b9107ba679e97b188c10f1b959c09acd7737bbbcd1cb5064c5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URLs, including one pointing to a raw IP address, suggesting an attempt to redirect the user to a malicious site or download a secondary payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://holocaustresearch.pl/nowy/photo/file/zewevitoderodezoparadivud.pdf In PDF document text
    • http://colorfusion.us/admin/images/file/botase.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1rpqpgik0n7llohgbvccl53i91/12990953747.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/trar90b2n47i16421ahjfppoj4/pefusuzesebanul.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8fb551257cb1dec8fc73a56fdac9c59e/71681180695.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/89004460865.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/nupobudosivuwuw.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7093eeeb---numixolaxuwurekak.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/58504238001.pdfIn PDF document text
    • http://www.polni.si/Images/files/sufekakexojenufapezofe.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/noxolog.pdfPDF link annotation
    • https://nasikampung.info/contents/files/94510222926.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/81353506700.pdfIn PDF document text
    • http://midospa.com/upload/files/bomuru.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109081644147297.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/dupijerolu.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/zodiz.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/38253322393.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/75139422620.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0e531f82a---41972350573.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/tukubo.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/lesevoxofilepedadizejigu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc38e7ed7e---28641201046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=call+of+duty+mobile+emulator+system+requirementsPDF 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_off0000cecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECD 17528 bytes
SHA-256: 4b8b4963d94dba3a0e46a01849160d2971b2f2fa40daf15b5ce3294ef9eb1041
font_01_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 11044 bytes
SHA-256: 562dc904d73432b8cf9cee2d3db5cad5f9b7689cdf56f77f87a1b5fbc4a7ad8c
font_02_sfnt_off00011561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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