Malicious PDF — malware analysis report

Static analysis result for SHA-256 648439b9233d6882…

MALICIOUS

PDF

98.9 KB Created: 2021-09-15 11:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13c9a829eeedd086f8a2e49c09395071 SHA-1: a87bf5adc88a234cc0651570a4e9d2ea17082db3 SHA-256: 648439b9233d68824ff8400554ba1b9ade2ec6a3df02e6475c16fcad82701d17
164 Risk Score

Malware Insights

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

This PDF file contains a link farm hosted on multiple compromised websites, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming the use of disposable hosting for these links. The presence of a download button lure further supports the phishing and malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1614126ee09e02---riwadutonemuvez.pdf In PDF document text
    • http://doubler-son-capital.com/photos/files/vatuvoxepebak.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/tonuluwaxixizezul.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210904_024453.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/om5edqj3fnrcqv17elmfmoj42g/jolivugijumiwujifedazofo.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/momejal.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109041222184901.pdfIn PDF document text
    • http://honda-vo.com/upload/file/besosewisakeg.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138620b5a78d---potusilurupopubefizak.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362c2ff25d8---15721064572.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613165e6b02dd---lavusitenosasane.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/9676325526.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/radoxutufirurozozilapibil.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/povoxedexekurisoxavupat.pdfIn PDF document text
    • http://canoeing.by/pics/files/gimetajerudosu.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/zaludozanogunewelukibe.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614129ffd9868---19309207870.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/lajimalor.pdfIn PDF document text
    • http://baoveantam.org/upload/files/66850181513.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0a8d80116bfa5c49d3dd92cfe6b6f17b/rugoneputifuwa.pdfIn PDF document text
    • https://digireg.gr/upload/bipigovuduzifomonu.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/tolitodatuseruluxakoj.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/robusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hd+best+movie+downloadPDF 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_off00012061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 10592 bytes
SHA-256: 0c6d28b9c174f741b9a4489c3059f008f07ae49524eccd599dc4caa32f65eff3
font_02_sfnt_off000150a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A2 17460 bytes
SHA-256: f008324161bd088d5cf5f85be07498e35c672b6a808be18942b891e2a34a5699

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