Malicious PDF — malware analysis report

Static analysis result for SHA-256 a337056069ede04c…

MALICIOUS

PDF

92.2 KB Created: 2021-09-01 23:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4835d62c3bf3bcb245b1dcaeb487a004 SHA-1: db2281c828df6df85b16cc9c9cdaedbba536f83b SHA-256: a337056069ede04c58e7569e04072ec43d398165685f6bbb63c574ea2cf2c79d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f5662521fbf58784823d999979897754/gatigebunesenana.pdf In PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/54743848761.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/24010970147.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/jikina.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c15294e63---73389386930.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/246b4pb4blvqpjofvdaau4crqh/19174820618.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/b6dae50b5554980fe91e79537c0a4883/lirovikowu.pdfIn PDF document text
    • http://rsst77.ru/upload/files/86004655097.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/snqso9ra753e7a6b2s49mhk894/jepixamalududujekojoj.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9f9d0bf26d187032e376ae996c19c07b/63845202768.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/8606ad5833a0aeef80d88288be518b90/55403901474.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b6419e0d---pebafolefunigulivoresalun.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/29333693642.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/fb751f65cabf6084971404b8f9cc7f51/dizogasujatujevevojuduw.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/15419215637.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/kemakoriruvulupipadi.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/82289290102.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/83393287323.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/pirosor.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609278bc800d0---53145878117.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210807040902.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/nujevekanokuxiv.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/87818062662.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/risofizuxaxodepaxezoror.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=epilepsy+meaning+in+medicalPDF 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_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 17984 bytes
SHA-256: 3972f5f8cf6304fc70a6587ceb0866137a09bef63433d91229cdbc60ba4413fd
font_01_sfnt_off00013363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13363 10636 bytes
SHA-256: 9010004eca6ed13a493da15065136332e75a87c6c1fb7872274e32e8d0d1c200
font_02_sfnt_off00014b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1