Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f68970499bfa49…

MALICIOUS

PDF

68.4 KB Created: 2021-10-01 03:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7aaf80ba76a9c4220d74669f8d0bbec SHA-1: 0902ea2acf07a16e763bb7bae6d813467db1542f SHA-256: b9f68970499bfa49de130626c25b65c27ecf9a4af2bfb8a39241fcbecc5baea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to obscure malicious destinations. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns suggest it's intended to lure users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://stamforgtechnologies.com/uploads/kuporika.pdf In PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/neruzevovozovotar.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/29309644526.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/dilame.pdfIn PDF document text
    • http://dasbluemchen.com/sufajeboxukataxazi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/12s2c9bp0ogdpag3uq2fdqo8qf/23453347254.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/44243387458.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/zekinuz.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210908172953.pdfIn PDF document text
    • https://phr4u.com/files/70732177103.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631485103.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/zikateg.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8e8b990db---wezemigomab.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/zigememidirojetafupowo.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/gujutusuwexelemori.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/6508823101.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/14397002380.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/dugitop.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/bokepu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614091d9c1322---vokevuludusu.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/naxenuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=newlands+classification+of+elementsPDF 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_off0000abef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABEF 10600 bytes
SHA-256: 0aaaaa01e1a82c279f64b2d7b601b06b9f252f39647fecbc38ad76ab28876da9
font_01_sfnt_off0000c42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42B 15756 bytes
SHA-256: b9c2bee1b798f2e36d950ab3f8e13a4fd5f0870cb22848fdd28c1cce659175ba
font_02_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1