Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b32a56eda66abd…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 12:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddc8ebcf750c9172d557a2905c734427 SHA-1: 55b8573f5b4ec455cc66632362ff20eb64ac065a SHA-256: c1b32a56eda66abda4e15228986de98bad940947d4c2ab786e697739a3160fbf
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://maturana.cl/upload/file/14825109231.pdf In PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/7719637758.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/48157337763.pdfIn PDF document text
    • https://digireg.pl/upload/14493260774.pdfIn PDF document text
    • http://totoumi.jp/upload/file/revifemawenumumunuxenix.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/gekorubu.pdfIn PDF document text
    • http://billsky.ee/files/file/korisefelixezuf.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/poguvepamen.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8730ce4bf92991bfedfe05fb811391d0/80733916326.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/xowitujanezezowunexava.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/43071302435.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/wefipipexag.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/wiloxoputizimafaboziduro.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/buterowofedobodosel.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/63958025440.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/42296322047.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/77870161393.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/32897440295.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/zoxuzi.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/20668200186.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/lilenasopapazotiluk.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/posaravotanojizuxokusiw.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0dea9cc7167fb35540f715ed0464fc4a/muromewutudipulesesujax.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2d57db85f---73719089303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=xiaomi+unlock+code+to+imeiPDF 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_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 17964 bytes
SHA-256: 2d5db3aa5c414c5587aea9f974a28d60615ee92a8b11d7d043e7b511aefc23e3
font_01_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D17 10460 bytes
SHA-256: 270f66b83168118bf739c86570aeaf5141fe309f5e16ad5181d7467ccce2e9d0