Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec1bb7c67613962…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 22:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2a7bb2c72932cdb54567b8b7090b072 SHA-1: 69fb95a0830a8b72ac539dd0275f364b9c8cf733 SHA-256: dec1bb7c67613962ea0cc0bc75e12186477c7505e90478fb6f5a88659bc45e8a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://savvyais.com/userfiles/file/71401918415.pdf In PDF document text
    • http://beauty214.com/uploads/files/202109250945538542.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141630abe490---9947670862.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210912070510.pdfIn PDF document text
    • http://denge.aero/upload/files/junorireziduparateletafat.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090823482548.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/38708516527.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/gaximumogage.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/gogoxetobiviwajimukivotu.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/ginudenufiluwibuparuger.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/39876406326.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/87931914468.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/57037710051.pdfIn PDF document text
    • http://email-database.info/userfiles/file/35084120200.pdfIn PDF document text
    • http://cartopack.be/Images/file/gakejomupirumize.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfc57c5dc0---92660949463.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jagebeponomij.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/dupawotenedawotepulefuxi.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/dazemomuzagapuj.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce5974ac2---ropinewagewedataba.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/sawug.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/h6di1minfu5qd4jp5kvk35n7tf/sakogexodinizazer.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/83066143393.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/34140228067.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/zofuvujawewekowuverema.pdfIn PDF document text
    • http://hkacca.com/userfiles/40446946231.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/64594589436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hdhub4u+movie+free+downloadPDF 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_off0000b9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D3 17080 bytes
SHA-256: a29fa6034c9bb251fb7538c891e7c0fcc4b97755d1f90b820aa5fbd62112e1c0
font_02_sfnt_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 10812 bytes
SHA-256: a85d6c13d2bcf6df773753c22e9385eadd1f90b1e2d7d81f58ed4a99e80d12a5