Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb51bb3783c93a8…

MALICIOUS

PDF

90.0 KB Created: 2021-09-03 19:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ceb9ceca07cd25f4dfbcfb328c11b893 SHA-1: d918716997099508ff5433a03a118c2f9ac1d8ce SHA-256: ccb51bb3783c93a8b413ae6f6e6cc6292fa451cec9db07719c92648dcfd684f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/t0ub83j3ilif01tc2l2e66g3se/32065050953.pdf In PDF document text
    • http://www.chubsorn.com/file/files/57904134738.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/392e7d73bcde02eadffff748d57c4dd9/wepolupaxixuvefakujiki.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/23439903179.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/30553150814.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/92639811877.pdfIn PDF document text
    • http://sksound.com/userfiles/file/2895766038.pdfIn PDF document text
    • http://3sdent.com/upload/files/14910672669.pdfIn PDF document text
    • http://hydrem.ru/images/file/76246575794.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073d91e01227---rudakijaxofanipasumisexuk.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210809_BF60706B56602921.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/9703792618.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/60601087285.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/6f47f9e303006cdad9a95ad6a950b1a4/44527105802.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/37260637055.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3beb60597604d9680ca1d6e1a35b772c/30709722749.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/79619213116.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/riwaruj.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc6594d468---siterumixezozedakin.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/tipojadovefoburijig.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b5cd0aa587---25753316516.pdfIn PDF document text
    • https://rintrans.com/files/28166568702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sample+marketing+plan+pdfPDF 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_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 17544 bytes
SHA-256: 4b2c30792cf6551b95fad66ef0ec5b34070c89fbbfd8d9a3f110b82a9c04fd56
font_02_sfnt_off000141ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CE 10720 bytes
SHA-256: f8ecfb9e986886adb7021aa53688f51b7380ef804d47764af942ab62cb7df0cd

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