Malicious PDF — malware analysis report

Static analysis result for SHA-256 8579d71356754595…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 08:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 55a206f67ee524e4eadbf2f7ec550e9f SHA-1: 5d94958bd01fe8c062f6e4a19233ab1966226499 SHA-256: 8579d7135675459577f49fcf79755a74a02a7df3cfe7f8f404365d15c7e2e982
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The primary function appears to be redirecting users through these links, likely to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=the+king+of+fighters+98+android+free+download PDF link annotation
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ok3erfmn980boi99rkkdesl0cj/15095121574.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/45517205057.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/manatubinemuwosazudex.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/77165830619.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/12899723723.pdfIn PDF document text
    • https://phr4u.com/files/49613081719.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/5700626485.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/80710394150.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349a8c07303---1565566567.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134efb8c4d1b---98264089230.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/14500957148.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/53soqbc94qag8tsdiip03gd025/nemabex.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/31976654219.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/60277380812.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/zamijerineziv.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/64991212995.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/mivexunemigejegad.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/koruwonisebotirowu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c660d4d806---64840145356.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/86248170484.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/22976160025.pdfIn PDF document text
    • https://togeltop.net/contents/files/88442571435.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/kikuwusisiz.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_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 19172 bytes
SHA-256: 993949d8abe03a9bb08f68f505b5f0857343bdf93cfb61ff5ded6befe48b8a9b
font_01_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 11152 bytes
SHA-256: 83aa94aaaf3ec82c23ac55d185f55ba37bc8969a14a8831eeabc51d4c76d0c9d
font_02_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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