Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5f1436edb248bb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 10:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa44100fee0dda4c466e12dd44711893 SHA-1: c67e4b37853f3a5e90da91cdae11ff4bcdef95f6 SHA-256: 0c5f1436edb248bbc666d5273b9c1c995c82c8fc38036a22e475db3d8d408fb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to external sites, some hosted on compromised WordPress installations. These URLs likely serve as lures or downloaders for further stages of an attack, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://garglob.ru/uplcv?utm_term=read+only+contacts+android PDF link annotation
    • https://unique-u.biz/images/uploads/file/75621626757.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/binemiluzumulubifajof.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/panukizawarunun.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/rekuw.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/gupagawikafubufevagefural.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/beguzerapisidojusedilivin.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a19adef949---dewetazonisibade.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/90247610192.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/95179281478.pdfIn PDF document text
    • http://abbaorphancare.org/survey/userfiles/files/72734046069.pdfIn PDF document text
    • http://home-plast.ru/foto/files/motivuzo.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/zumapitez.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/zopegefepozavojukinobodo.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1e19a498b---fupekazazetazagisokas.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/39486188846.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/wezegugulerorivexi.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/8829016446.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/jofajuradavaluvame.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/mizekokaki.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/71423704383.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/nimaxukogekorajev.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/72895133625.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/99646260140.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6507e0cdcf71b3c13d31c49f98384674/mifejalakuti.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/43026926200.pdfIn PDF document text
    • http://tecksco.com/upload/files/80258803892.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_off0000d711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 10520 bytes
SHA-256: 7d29af84a7a5b049d20d08a9e4eb52a378fb9dc0d82ae659ed8f57bcb5c35a52
font_02_sfnt_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 18120 bytes
SHA-256: ca5a72d9b57e5aa5570de5e7cae7cd2b68e3d8673a78e565a917b77a509da2ca

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