Malicious PDF — malware analysis report

Static analysis result for SHA-256 912cec714380bab7…

MALICIOUS

PDF

81.1 KB Created: 2021-07-24 08:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8705a5eaa738fdeaadf2b4d2e6d40732 SHA-1: 2290914bc9f890d3a18fd828173219ac328b5ede SHA-256: 912cec714380bab7a49d9ce4193dbb29bf7c6ac4c7b678c94cb510ed391e6df5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly implies a redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/25364875890.pdf In PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/ziwanajorekefakujaz.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9a5525e88---47585550940.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78c685654---wipakip.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e07dfd26fdb---40131475011.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/3osr6i7ko01ma99ecs58689je5/99575268218.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/21af81900bbdd3b04b053d541c93ec90/83988694627.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/nesojameboroserora.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/jarokajar.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/cb8625261773443704624d0f29d31edb/22685522143.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/821e64648aafd3bd95b0caea50c4aa95/61157468683.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/90429515311.pdfIn PDF document text
    • https://masukpt1.com/contents//files/68072179838.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/kotejomizaxuwatowa.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfe6790b50---72958680099.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/73299359903.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/xarozotexo.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/73179307477.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607054ed371e1---najefewebenapukoxewomakel.pdfIn PDF document text
    • http://homeopathyhk.com/files/xirojebukiteke.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/memaxor.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/sukig.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/rudado.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/99741652793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=exercices+fonctions+affines+seconde+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_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 18772 bytes
SHA-256: cd2a621a740db7691f3ab57cc50173a6d9044989343a302145c9cc26abed5cb8
font_01_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 10652 bytes
SHA-256: 184ffea923b315377b3e91f679353fd0e1955849b09c0d8cfec809956d7894a0
font_02_sfnt_off00011cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1