Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1105638bd43117f…

MALICIOUS

PDF

77.7 KB Created: 2021-08-30 00:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7be40010609d40bc45b7e24ccaa3b9de SHA-1: bcf3c5898ba0070a7505872393fd2a8bef65f5b3 SHA-256: e1105638bd43117f105297ada53df9f8fc87caa8705c142dd2d72484b8dd7e6f
164 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to compromised websites, many of which are hosted on disposable domains and utilize WordPress upload vulnerabilities. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d180198210---11517161135.pdf In PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/bixudili.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/vokurefukazinevovevan.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/29419311589.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f702a367c2---40576754391.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/66714477432.pdfIn PDF document text
    • http://cabini.it/userfiles/files/mifowokewuwixudilogewuvod.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/kpslsn3212g5uhoi9hfs65vm7v/88025205468.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ecf2b419cdfd462fca50abe61658ce61/71997073569.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/xesawo.pdfIn PDF document text
    • https://ags-car.com/upload/files/mefuvorixi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607942f5a6dc0---tipukeforawa.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/gukumipe.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/40ac765823e8314feb5a8e3109f45aa6/66726323033.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/woxasuzol.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9ce9cda3f---26361584063.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/33349403450.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/29357962065.pdfIn PDF document text
    • http://adveotec.com/img/file/68542402697.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0d893bb13---zikebox.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d273edd724e---88786057952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=klb+cre+form+2+notesPDF 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_off0000cca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 10492 bytes
SHA-256: 1329cb183338c253d4cc04e742e727a9e47aa47e80f77d957115fd6f35df1900
font_02_sfnt_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 16900 bytes
SHA-256: 302f008db67490c4bb45ff86f8104d67af1d6c5e1d02f4bb606b67a56d241766

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