Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6a9e985ceb3dfb…

MALICIOUS

PDF

90.3 KB Created: 2021-09-14 05:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7086426853632847ff7068f9004b2388 SHA-1: c95de15d1558eba334892ac183de766f89a7586f SHA-256: ad6a9e985ceb3dfbc0b4a04471158fc4510b6877c6e43378f6013251ff7fd662
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=hacked+dream+league+2020+download PDF link annotation
    • http://tischtennis-kiel.de/images/file/53272945587.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/pilebupefaloxo.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/xedesakebifudowuwipizuwat.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16130ef4860430---baxozerubomawizisirave.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/zitofaludelinexelogo.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/tuvujemoro.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/jegivadof.pdfIn PDF document text
    • http://nova-auto.com/upload/86755457742.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139082a36200---kigejadadixivomidategoj.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/xevomumoxunej.pdfIn PDF document text
    • http://candientushinko.com/images/file/kawozuvaf.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305d6838b7d---16017810124.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/ligobegu.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/7518900541.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/wegojibizafapitej.pdfIn PDF document text
    • http://islandpointfl.com/userimages/divipidup.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/56234978709.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/37806321361.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/7372931224.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hdbqhk0o2tcog8o4alkis9i2k5/lunusolufajidizapozade.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/21380824583.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/84676030852.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/dujekaxibajosagafisoza.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/rojivilowizonir.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c5b9a5c0---babavajosipupapuno.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_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 10868 bytes
SHA-256: f7d5985d364371f6ec8841d19ce47494d30b4664eef79239fd7ff5116b7e7306
font_02_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 20776 bytes
SHA-256: 65428d68824307b467af88a027869f4ce8c7e37b8652b736bb9ef2727dca7fe4

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