Malicious PDF — malware analysis report

Static analysis result for SHA-256 0378df48d3b099fa…

MALICIOUS

PDF

74.4 KB Created: 2021-09-12 03:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2b5e32e0e7e699c81a40e0f5f80d05e SHA-1: 100a00ab46d9d460d3d565332fb9b7c8fccadae1 SHA-256: 0378df48d3b099fa57ef96f8352cb14d44c95c54fb7b6858ede44fb4c6bee93d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.bmo-agencement.fr/ckfinder/userfiles/files/laxaduvep.pdf In PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/98374941724.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/47405441597.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/56262758155.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/68213480770.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/ropararejulipakaselade.pdfIn PDF document text
    • https://mmtours.si/uploads/35183670138.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/33438267142.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/voretajozamazadizukoriz.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fa6c0f22---99381134629.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/zuzokego.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/7438854602.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/kezozibijilufi.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/zemubovaka.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/bimir.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14313456201.pdfIn PDF document text
    • http://creationart.hu/files/file/saxegasonamavobebotoretaz.pdfIn PDF document text
    • https://dm288.rs/slicice/file/57262162194.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136438891b1c---meralufigazazewejaxi.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109101852377370.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/jawipelaxewusorapufa.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/58163229759.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136b341b0a45---10120393330.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132795e451a1---rubetufapogu.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/gokadesoje.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/91766274386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=best+moba+on+mobilePDF 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_off0000bf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF86 17488 bytes
SHA-256: 5f1e56de21e97d60d22b3cb9a8fee37d44a4d8e0c7a4544919cd9c4865229474
font_01_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 10360 bytes
SHA-256: 864c67094d119cb2221f4197bbdf9f09f64cf494a171628c15737a0c6fad63dc