Malicious PDF — malware analysis report

Static analysis result for SHA-256 b321caaf2b632d98…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 19:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a847d09214e9fd4ea8963fddcfd1b7b SHA-1: 5bac0d93d1831b3c560c8e9a507dc60e88d77c94 SHA-256: b321caaf2b632d9871cfa89fa616a6d4d3a7d8d546dde07c05679f7603b62ecb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript (T1059.007) indicates potential for malicious actions within the document itself, likely to facilitate the download or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://hanoihome.net/img_duhoc/files/52944882031.pdf In PDF document text
    • http://mayjack.com/upload/files/kopenozobedaz.pdfIn PDF document text
    • http://ternovykh.ru/content/file/gipuvepotodezulomasefiwuf.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/89985715857.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109182014318733.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/xazejebevinuwudejususajil.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/94611096392.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c502c6478f---raxanebozoxefolafe.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/bexun.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/80515137039.pdfIn PDF document text
    • http://tyextractor.com/d/files/zevexukuxuvena.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/3398517952.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/33636158604.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/japuguseloxov.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/21881498634.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/kubep.pdfIn PDF document text
    • http://rococosofa.com/files/files/kawij.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/29671932949.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e17fbbaa05---81899422847.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/nosebimagomajiwikuru.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1191e0623---tidolazaxikapejibafigoju.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144641b2be63---24414424481.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/21991379007.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/68067109793.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/95389935267.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/konarogujovisidopamefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=embrace+the+struggle+living+life+on+life%27s+terms+pdfPDF 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_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 11388 bytes
SHA-256: 0299fe6945998c3eb09188831f32e83d087c67a888f7603f2070a89655e5baec
font_01_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 17748 bytes
SHA-256: a69681cb7ebd0e00b791525d2fc7219d7162fd279d2f98fe063ef9dfa9571a0e
font_02_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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