Malicious PDF — malware analysis report

Static analysis result for SHA-256 442aa964dd1d1cd3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 12:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 270112ae02f220b34bce00c96cc0236b SHA-1: 664ab3089c82bb1bc9ed52a87e4aedb92d3c88c8 SHA-256: 442aa964dd1d1cd38d6d50e3b8dec6ca3f15886ea486dc922968064279a1fd2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting. These links are presented as a link farm, likely intended to trick users into downloading malicious payloads or visiting phishing sites, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=chromium+download+windows+10+64+bit PDF link annotation
    • http://tostonet.cl/ckfinder/userfiles/files/tinanexavenodugezelalovaw.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbf50bf5ec---2349266620.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/lipuve.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/25561551907.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/nopijukewurufawe.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/jegetefelasavolum.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ad3238c99494e2b5d818204167e6b39d/11394398364.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/futefekuxavukogevaguvixil.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/fotujozasiniwudoki.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/tubakojerolisuje.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/57651894437.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/82960947728.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1833001d---vajujoranubanuxas.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/43728212824.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109020817331696.pdfIn PDF document text
    • http://btfa.tw/upload/files/kezivatadaxisate.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/voteguzimiv.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/54773786957.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24fa99b5a---mebatapibuk.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/darisogokid.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161325da9279aa---63785141587.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/gisivadabapagoneg.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/14765058554.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mofawogi.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/1395675872.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_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 11156 bytes
SHA-256: 44d60bf13a1068c08ecf0e36f281f8eef02328d3e0b7c6bde89e1f94ac609008
font_02_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 16784 bytes
SHA-256: ac315f337f995a17c711b526602715680ca0db7ddfe096dcb69d2b9683848230

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