Malicious PDF — malware analysis report

Static analysis result for SHA-256 c583536c29fbd98d…

MALICIOUS

PDF

75.9 KB Created: 2021-09-13 02:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a58400d63f72afc83fec13b671e3ca92 SHA-1: d040f01e8f183d326af31ceb05db9d31621b4837 SHA-256: c583536c29fbd98dafcff79a56c86f383b0416a25f5457cffc086a01d196ef12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm to obscure the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://rm-centr.ru/uploads/file/50823380494.pdf In PDF document text
    • https://lotteppta.net/beta/assets/file/10382601987.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/55339954074.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/25724564691.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0b69dc18e5240f6a84fb413f5e5ab81b/57698826066.pdfIn PDF document text
    • http://vhshf.de/File/12995851265.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/77326320353.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/93043080637.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/rufewaviduwopos.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/kupap.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/zuporexofoti.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/fitemogavifigupaxijatis.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c1e33e38e3b012a4dec102de76b955b0/nebiseterowex.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/nutemalilagesivufapat.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/xanodaxeguwodikiwomafopon.pdfIn PDF document text
    • http://rinsacars.com/files/others/63242802081.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dae424f43c---79347961128.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/vuvafuwimute.pdfIn PDF document text
    • http://beijingteye.com/upload/files/48487703388.pdfIn PDF document text
    • https://webaprint.be/img/file/58538197030.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/nipalexujujekuxitenusuv.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/73747974886.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/zatit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=back+button+missing+androidPDF 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_off0000c458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC458 17364 bytes
SHA-256: 7d8cafdb51f2231718e1074726b7a79224bed05ca5507094bc5c9276bc99edf7
font_01_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 10920 bytes
SHA-256: 1128164ff4e1daf2476a1b4a8636f9a2d4f15996be29ec06e05898d50717892a
font_02_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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