Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68692fe6b67060e…

MALICIOUS

PDF

90.8 KB Created: 2021-07-23 00:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bf5a91980d722df2ed315f26f4c0279b SHA-1: 3ecd837feae01a35140588c37822da0869f72891 SHA-256: c68692fe6b67060e02d2f46a3e344db7045bdd5be116901c21242d5d02afb4cb
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs pointing to compromised CMS upload storage and disposable hosting domains. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://avandcie-automation.fr/ckfinder/userfiles/files/lanijufadine.pdf In PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc107edcf2c---musezapajobasavaju.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a62ae1d18c1---36305120844.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/zononelivupamajefoxeka.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/mulirexasovolebexatuxume.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/medaxejapobedusaxa.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/76287843842.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/bf03e445537520f0910fcb8a17320ebd/rebasejotunawor.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160740bed7a614---rejaw.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/12367157382.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/koxumutapasivokugop.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/76826bdd48087912897293cb9d0b5f08/29285556590.pdfIn PDF document text
    • https://olterus.org/contents//files/55182392883.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/panesevofotopi.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/zunigujosuwebuv.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/72138351461.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa00108a6---56104698399.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/derumipumiwomunolemisa.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec492d090---neguxagen.pdfIn PDF document text
    • https://congchung7.com/upload/file/2035842966.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/nikomudigelod.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce73ed4c527---gowebadirutazepadox.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/negixowipusenapewab.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/59b5ca051c41fcd97446923ffea096a9/namavoxekuva.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/medufasomafeves.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=really+offensive+one+linersPDF 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_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 17300 bytes
SHA-256: 744271acea17af63d50965da1748b01b9b307c771ca62c9bac3e5c2de83b9b0b
font_01_sfnt_off00012e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14642 10336 bytes
SHA-256: c1f4f88003f566699e85ce6757b39f43314c5fb214347fcc257ffe8c2ed3ca9a