Malicious PDF — malware analysis report

Static analysis result for SHA-256 f140a4647e8d3c4f…

MALICIOUS

PDF

78.2 KB Created: 2021-10-02 13:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a25a324c9c75c78942b054e388145a0 SHA-1: df2554deec451d62e8c702dd7746129bbbef4c2f SHA-256: f140a4647e8d3c4ffa6c0de614a64b070717b51b05604ba8383c05c356a6e7b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary attack pattern observed is the use of a PDF as a lure to direct users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9719

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://lmtechsolution.com/userfiles/94877864787.pdf In PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/joxeketanelir.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/51360466441.pdfIn PDF document text
    • https://festacontinua.it/public/file/9606314058.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/33139845025.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/lesujebakejemujosomikesi.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/82309535691.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/26615341269.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/88563580973.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/19642720652.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f013ec3628---12990117900.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/selilaxoxipixozo.pdfIn PDF document text
    • https://tigaintan.com/contents/files/66157467784.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/rajadizonowofixebim.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/54ffe67933f87a6bfd299385559aac7c/rebiketumakexuwejago.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/89942775957.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260c3ce03f---pepefajusenunekobak.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/fuxozikavagitaxisisas.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/56972484302.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/nekezax.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1614acc9c2ef89---95923209474.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/6312170733.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/fobavazofolujolese.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/47484345285.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/luxadilizipigi.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/77848413193.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161582bd862a7e---24234403493.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/diletinon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kiss+back+from+you+lyricsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64C 16560 bytes
SHA-256: be459a5a5db34f34e8a522b8beb130f333ac608b56949ecb4ff999f81ef25c1a
font_01_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 10600 bytes
SHA-256: 80189f231c0c9a097b8701e4d512c7952c047c83e39700d36d3580410d62209f
font_02_sfnt_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 16772 bytes
SHA-256: 471db773b9a233a641bcf9a9fde49fb1a58120df87dd44cb752e7572c1f22495
font_03_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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