Malicious PDF — malware analysis report

Static analysis result for SHA-256 829a085b124e801f…

MALICIOUS

PDF

89.6 KB Created: 2021-09-10 02:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0fe22c2b7e809f841662528662deef8 SHA-1: 10d2b3e9c46b588ec65d06fdd2946aa99b287382 SHA-256: 829a085b124e801f9345c8309c962421d7a7f66762c15f4fe635aa614dc6a72b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

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 https://coretry.ru/uplcv?utm_term=instagram+likes+free+trial+20 PDF link annotation
    • https://tonere.shop/app/webroot/files/userfiles/files/88720083252.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909070333.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/2992431190.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/wamujuteguzaz.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/muzupukejupanukomig.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/pikotakoxezed.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/tovujabifuwagiwemotazile.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/tarusuvakugojoninaxono.pdfIn PDF document text
    • http://midel.me/userfiles/file/lawifebaliresetu.pdfIn PDF document text
    • http://fohow77.ru/upload/file/bodufaz.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130d332048c4---31636300823.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/49ccdfc125c864dbc68c73669be2e892/17390283211.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a817d30e2f---xibewepitudalavaxosasera.pdfIn PDF document text
    • https://elemonbg.com/Files/File/jibiw.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15313d172---20660689431.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/papuxig.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/58963664022.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/16197801450.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/bemepuvebivoben.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e20a3ee4---92640295128.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88001524918.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327b56d0fd1---xafarebegav.pdfIn PDF document text
    • https://angkalaris.com/contents/files/89032905505.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/89826663720.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/51824112351.pdfIn PDF document text
    • 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_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11206 10720 bytes
SHA-256: 31949dd074d8e99cd776584beff678717bd7e4ecd68107973fe2ed83d05095d9
font_02_sfnt_off00012aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 17980 bytes
SHA-256: f91bb92612c54e519a2b6bb4a514575a89002c7dcd5abe01283a733777ff18be