Malicious PDF — malware analysis report

Static analysis result for SHA-256 401d33f04443f6c1…

MALICIOUS

PDF

91.9 KB Created: 2021-08-17 10:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 79262ffdfe080041861224a8e139a899 SHA-1: 8be7a56769bb560c32548eefb9ebc479b65df333 SHA-256: 401d33f04443f6c1c5b0d2a0a2889ee5ba80f630ed169cc91c9001577523465e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161140e72155be---40427135803.pdf In PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fde36f793ea---57412832848.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/rejoxovokaxa.pdfIn PDF document text
    • http://master-br.ru/img/file/59552824527.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/jexekuwarolifores.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/13ad4bfb154897c7b55031fa83d5de00/fakagifugidasote.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/60366335093.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712055ed9fe---lorixitenijerefuwatetera.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/novejuwob.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/lalemoloxujezivupuw.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/sinenabisapanivavuvawe.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd32df1005---jugamotus.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608576f05e1d0---feregitamugelusujakipalej.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/80949491721.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc59c41349---ruwizazukaninubojineg.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/7b9c8ec68170c04072d4338aef158ca3/gaputugamidegumuru.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/297lcf25smc8v5tthl4gltqble/17436722280.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/dejexodezedekafaz.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/7d2f65db1e300448fc9decd9a7b7e5e7/jitavoretomigomunusuxemiz.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092ce6e4b298---6396766441.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/61972362735.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/dekomibumesadutitirajafi.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/7368332587.pdfIn PDF document text
    • http://ubest.ru/images/file/27632305853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chemical+reaction+engineering+levenspiel+2nd+edition+pdfPDF 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_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 18472 bytes
SHA-256: 6cb737e9b5092567ff6dde6a31c84a46b6f008f613e3d5a1dd519809fa1e3f96
font_01_sfnt_off00012f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F90 11284 bytes
SHA-256: 488b7fbe151944cca689b124682da0b3e6d2da0d7c19f3cc35ce6104c6d02767
font_02_sfnt_off000149ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1