Malicious PDF — malware analysis report

Static analysis result for SHA-256 c772ca49b61b716a…

MALICIOUS

PDF

91.4 KB Created: 2021-09-03 20:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52f9166e590858887c967f21fe79bdb2 SHA-1: c1e6e20813d0c9c702fa5743e09631ee5742a881 SHA-256: c772ca49b61b716a6708e43406cb743f2fe0dba81c1cd217f4d839d14eba34c2
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to potentially compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised CMS uploads. These findings strongly suggest the document's purpose is to redirect users to malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2183

Heuristics 5

  • 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
  • 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://flynewsletter.com/uploads/file/kopawem.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e1332ec5dfa---jusibopodujolorefo.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/zitevexufavupu.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/83905825153.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5725079e77ef90960f378d4d13cc7577/jatibujufuv.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/vijagaxosugekerowe.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/gosizexenutel.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/medewebakiwajed.pdfIn PDF document text
    • https://tavio.ru/files/file/bejozidimesopofazokis.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210523152515_189240231.pdfIn PDF document text
    • https://wecareprogram.org/images/file/pebafub.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/miriraxuzajepa.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/dadubepam.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/369926b17cc6fb3ed4497a4ae25b42d5/zunozimulukarodug.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/94185502268.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/39022927286.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/vogunigakakajavuluxo.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/sivowapiravijajuzabud.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/aviveropedujokanifux.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/mijikikaxizud.pdfIn PDF document text
    • http://gibisch.org/files/files/68402527565.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d12f102cb---lubipaladatesokatajiwuluf.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/gedifugurek.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e971c50db1430a3dd984eb8c17a3b0ec/guxumimamibutuwa.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/80852489398.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/100810534255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=system+of+equations+word+problems+worksheet+algebra+2+answersPDF link annotation
    • 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_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 11816 bytes
SHA-256: 1c6ad703d78541d182a0d7034fb49c6665a3608c540da74bfe51b80f9bacb119
font_01_sfnt_off00012851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12851 17896 bytes
SHA-256: 178a5c4f086b125f325d1e8237c26d14cab34bb4bd0220d65151e120779aa40f
font_02_sfnt_off00014391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1