Malicious PDF — malware analysis report

Static analysis result for SHA-256 72689554a8a0d24b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 11:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a7f1ea2e6ca10850e28f79bde9470bc SHA-1: 1ceb7f534c21b3d9523dadf372cfd22878b721a3 SHA-256: 72689554a8a0d24bb0780c18ef8e02ad46f6a7dde4511d2cb887d38403957bef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://danielfelber.ch/userfiles/file/97867042228.pdf In PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/9598421875.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/xokexugaz.pdfIn PDF document text
    • http://short-story.ru/upload/file/zirawowelarevugux.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b39ab494531---ziwuvotegaxal.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/rajiwex.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f876e5dec75bc1d088b393599e8ca9e3/nazenujesomubixi.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/segitubudobagog.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b878f10b92a---gobado.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/tedasamuxufij.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/f7ee6f0c48ef34ae407b5947a619d059/xezilevekope.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/xolopirakegomuwidapevu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c71218e827a---16568931230.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1228260a12c143b9b695780a1564b207/totibenevuluxom.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/62453376443.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/pewibofotupevunavuvibetaj.pdfIn PDF document text
    • http://abwessex.com/uploads/files/92506629860.pdfIn PDF document text
    • https://jurad.eu/files/file/36980542320.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/6e54629b2fa85b5e92c47c7845431ebd/63142880655.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/25ec4f531cb059acaca667d1e25d99e4/wadaxizogepor.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/gataromukabovabolos.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/82156852235.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/lurivebuxudutuzujojaroti.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/45543545410.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/16118995911.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00b648fe6d---vanedusisarugerijiraxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=satellite+communications+pratt+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_off0000dcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 19520 bytes
SHA-256: 67956c2498dc04ddc9ad098f9dffb8190319c842efc9f29363fc1eaa4ee10256
font_01_sfnt_off00010f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F26 10956 bytes
SHA-256: 22d111d29925fe83a5bc56bb272254c7ca76dec87c243aacafe13937cac20efa
font_02_sfnt_off00012881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1