Malicious PDF — malware analysis report

Static analysis result for SHA-256 3860793a3b5480d9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 03:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e55c0c1f6ada9180017556143230402 SHA-1: 55c5ee3a34b27e9af5d2a75ea936a71d71e7e664 SHA-256: 3860793a3b5480d9716a11c39e7b61616fffa36abac5bf228a5ae4604df8fee1
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, directing users to download files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics and a download button lure further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 https://k-barrierfree.com/FileData/ckfinder/files/20210904_DFD404712450D083.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db272e181e---40483506362.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/31601722535.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/sesurevofulizaju.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/nomofizu.pdfIn PDF document text
    • https://bloc-immo.com/images/53988901312.pdfIn PDF document text
    • http://24cvety.ru/upload/files/sitonif.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130250f99b31---76290607402.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f480924cbe---36493419886.pdfIn PDF document text
    • http://misbahelmudii.org/ckfinder/userfiles/files/zivuxamoke.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/71129855083.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/xofegelafuxar.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/99471074648.pdfIn PDF document text
    • https://samowar.ch/upload/file/dafanudutikodeworoxozes.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/91615910597.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/5129392947.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/kuzogewel.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/27273398297.pdfIn PDF document text
    • http://besteva.com/upload/files/sitedutidijezizadokora.pdfIn PDF document text
    • https://blogsma.com/files/lenavuropetinukeliwesupa.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/wavapakipol.pdfIn PDF document text
    • http://iucecb.com/files/file/30715754348.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/49539792577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mid+fight+masses+androidPDF 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_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 18032 bytes
SHA-256: 22bba40f9bd9cb004268f2f0ad91d1fb3fe47a171f9f90e93238a1da3d2648c4
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 10748 bytes
SHA-256: 7ddd6a8724250e9c1e7850a9bd6370485945835f81c08b2ebf03604ccde62b3f

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