Malicious PDF — malware analysis report

Static analysis result for SHA-256 3386763511f549f0…

MALICIOUS

PDF

78.6 KB Created: 2021-09-02 22:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 09f458726cff144c2af2a381bbaacc1e SHA-1: f384618a97e81a0c354a532b2eb1b69cafe98e09 SHA-256: 3386763511f549f06d802e835694dac70722a323bbfb7fd1261c0c2965c9e958
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5f9f3fa26---52066281060.pdf In PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/91135731354.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16102d5bfa61d6---3657077119.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/34287342684.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078df801653e---17593664342.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/61288597461.pdfIn PDF document text
    • http://df-foundry.net/d/files/42121091964.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/wesex.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/kenalada.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/dajulagikojaribanib.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071310521714.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/7f96330fc393bee05241708bd6dd00e7/74712238811.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/93727298195.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/pemasak.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/fewawarupagi.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/93486604396.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/519v0im9a092c8ovb28qa47qaq/moxageb.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e521150be584a57efa257fe34306dbf9/58202635829.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2e9d38561e2a9b8e8693d901e2209e38/zitidoxarat.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107140204575441.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/69813184759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=demonstrative+adjectives+exercises+worksheets+pdfPDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/runebologewezanuw.pdfIn PDF document text
    • 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_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 19312 bytes
SHA-256: 5bd01769303118189884d9ebf59c3341e3e866ef36579853c8b79eca92081cfd
font_01_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 11316 bytes
SHA-256: c258c30854b3db29dcef3f32358f138dde43c89d3448fddc9fd07e9e2e491a91
font_02_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.