Malicious PDF — malware analysis report

Static analysis result for SHA-256 07997570c61ea110…

MALICIOUS

PDF

93.0 KB Created: 2021-08-01 12:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0d3a44854bd11bc29c2ad5a2772481e SHA-1: 7ef009b175d02b5a86be19807dd737d1adb03880 SHA-256: 07997570c61ea110b3d6ccccf0b36d17ad30deb2f20067abc8fb0cfd367fe804
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of multiple external links points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://smidgel.ru/uplcv?utm_term=can+you+watch+movies+together+on+discord PDF link annotation
    • https://laughteronlineuniversity.com/images/upload/files/29707303620.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d20fd8edf---12606849234.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32a959c26---70387702685.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/819158473.pdfIn PDF document text
    • http://yongqingtech.com/d/files/48847171000.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/c1f7ed7c0c0f3c6881b791f2039fff93/26043493434.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/narinuju.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/30699124725.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/1752512019.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e1f7f240f---pagurogiziwazaju.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/8360d82cf859550ef3ea2d5fac7e2568/78250684649.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/62900496657.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/1gn8ntdhis0rm69bjs66mncavi/bubire.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/jajezifenu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b62c1ab4f107da1dcae3a9744efa8643/dulufa.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/hsnde31abpbn0o5acntdb9nndp/wuxiwekuxakamamajolip.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/jegabekuvikumitujelifexa.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/delubu.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/96b6bc2b704847816ac4a44339edf2e5/nenuzelirexoregelagixuze.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4b641ipu0aag31vndrrj1c83l5/dakumegirajoponupifi.pdfIn PDF document text
    • http://recviem.ru/img/upload/35196813930.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ovrtrss396g5psvcqbnnas30l6/53206724963.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fe21fb38d0b89711f072e7af907fdde4/nopebezusenowuladenokum.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db0945e1c5bbfe4a4fb1304bffe4c638/41270135717.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/l30og0asni5jnog05bp0i1l9dq/pusit.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7b3b878b---87034088699.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_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 11168 bytes
SHA-256: ce19d9e45c69c62c9ce4afcac7c7448faa770359a923eb993afad500c8ff8d04
font_01_sfnt_off00011f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 17168 bytes
SHA-256: 8293d966d491697707429cb7e6f55f12db3d0d88c1f32dd1f76b2273caa120c3
font_02_sfnt_off00014b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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