Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d42b27c686e515…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 17:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a50cee1880d6f027327d7746a442ba07 SHA-1: d25a902358d5e5714e42bd5834735f41d46dad15 SHA-256: a1d42b27c686e5157aa1ee5f470f2db7baab7c90d4f2e3236c25fccabb42ab65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of embedded JavaScript further suggests malicious intent, likely to execute further malicious code or redirect the user. The ClamAV detection and ML classifier strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://catamma.ru/uplcv?utm_term=12+pro+max+price+in+bd PDF link annotation
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lexomukoxavegef.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/869861f9796b7e1ef677d29dd49e03f2/lezaxanewigorib.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zumugun.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1ac774ff6---36526242725.pdfIn PDF document text
    • http://tabletopad.com/images/file/juzogag.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/kijinurezadewaserisud.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced80ceb97---rexezumifafipukevijafus.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630860211.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/46035348474.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/nemapulozebu.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/86530306349.pdfIn PDF document text
    • https://dyaa.club/uploads/file/vomitib.pdfIn PDF document text
    • http://scpt.it/userfiles/files/36555065720.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/89875497673.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/zijurojolerigu.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/devisifapadolev.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/100aef92e793ed9d0003871cbcc0f8ad/92460430559.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/28427560627.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/61255755768.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/13156559943.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3161599bd895db0c1a5dd9e67905d305/42525765694.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/buboxevukibuvifakuburosut.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/jixavudewuxiwareriniwazif.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/nujukekewabirafoxaz.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/b0fdf5046b2c3492ffe4460af1d464fe/64507977697.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/gedepolex.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_off0000b889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB889 10680 bytes
SHA-256: c117b8e6decc54750292a376b5a2f1cc92512d03a009ddf50c03b681216c2a41
font_01_sfnt_off0000d0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 17204 bytes
SHA-256: 23b50dc491e20b26191a9c0c4af367a84c1a24faa7ba3a609d22042e59d86b84
font_02_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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