Malicious PDF — malware analysis report

Static analysis result for SHA-256 148b83864199937f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 06:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ffa50eb527b1fe538f241f427d5aef8 SHA-1: 642aa5d27d6d57d5f19a82afe6395b30784f7ad6 SHA-256: 148b83864199937fd14cc58e50284c01de0aeb3f638a0cb2259b667841056eab
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. Additionally, the document features a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://brs.jo/userfiles/files/23467506905.pdf In PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/f40134a00f352a76e5e5872cd961b38a/37692590189.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/74177772805.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/xukalexofapolalibudenovak.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/65439775496.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b561b664fdbdc9e25e6bd398605f1758/nokepelugipizakos.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/qbmfn9duss846ph2d157jot00f/23855995084.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/foluvenavazumaka.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n3jor6l6lkri9tgmnjf0d38qe2/ruwiravegeperox.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/95117984756.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd15d5744d5---41605747793.pdfIn PDF document text
    • https://laser123.com/geektic/files/3542936833.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/vamezopejexigetusoduk.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5b1277b29---sijumuwolozexofizi.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/vkn5mo7mphkin6tbdtu5glsmfs/78296416917.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16113ce541cf1c---bezexapujulokomaluxapakeb.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/38639093888.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gojenanikegilinoxivozebun.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/76029064831.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb137e2e7---46415714633.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/13285923928.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71eac0f99---pesikisuzovebavekoko.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acdf69e589e---famox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=op+poisoning+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_off0000c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC997 17900 bytes
SHA-256: 332826569c6753cfebd73f6f7002b3564e930e93980ee6f66f87c13fc8a9c19e
font_01_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 10160 bytes
SHA-256: 3b28aff6ab983068e85489069baea49ad3b4d68db8576bdd7e773e795bee4840
font_02_sfnt_off00010d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1