Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6e4646d53a7930…

MALICIOUS

PDF

95.0 KB Created: 2021-08-10 18:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 211e7360c453aa3aa8a053242c23aa15 SHA-1: b013770f893f3d30bfef25d9e0ccb8a81758a626 SHA-256: 1d6e4646d53a79304c6cb5f52e190e4f5d1e21d6e203af2b05770d80b96a0a3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=shira+choir+sings+new+song+im+hashem+lo+yivneh+bayis PDF link annotation
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d59f84f34---lepenerumizamazamowuw.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f70ada9642e5942c8d48043d72a58db6/32440540752.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/fanemedebijonexinob.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/52383052689.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f7a3b7b33---94154425807.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fdfe470c3---durujumunemulek.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b86731df51a---bokuxofafosimixefuliba.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/1040811518.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/68666821517.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9bdf19233---mefobabebi.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/95783065385.pdfIn PDF document text
    • https://udruga-invalida.hr/files/kavususiguranekujeg.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e459b248eb58af5b6fc65a336ab0d40/beramikodip.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051612455573499.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/39491371201.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/likozilukazixa.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/87687226250.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/zerabanizeradoxoxibik.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/debojike.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160786dc3f23b4---nudizaxerunewediduvel.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/fifututegeduduka.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/771fed3057cc50a52d5ea38e43ecc257/wasixanumoveka.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/jokazevudowuxaxejodebi.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_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FA 11060 bytes
SHA-256: f704f938376ea36616891312acf46a2112f348ee753c31ffc4579a9cfdc55dee
font_02_sfnt_off00013d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D97 17744 bytes
SHA-256: 8c56b281fde805b4b092b98127ef90f07fd3d29624fc688ca85cfc2e4764f2fd