Malicious PDF — malware analysis report

Static analysis result for SHA-256 0333a221df74403f…

MALICIOUS

PDF

90.1 KB Created: 2021-07-17 02:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4607446e08803d31d9fe72d639010a8c SHA-1: 31ffd5bae964087da13f6bc0a543f00221a7ebbb SHA-256: 0333a221df74403f2e1557b753f27980c079dab84a8a6270790322407a2250a3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a PDF containing a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. Although no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier clean score 0.0115

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://sam-global.ch/files/file/morulegorejarulaxikaf.pdf In PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/mafefuwitufinesafavobapa.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b8018f165---samemosuzokevoxobuwe.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ee4d241f6---98291646605.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f1ae79582---5959922649.pdfIn PDF document text
    • https://foreningenflex.se/anvandarbilder/173/files/jibekejujabuzigilumitekos.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609130904a57f---sefinajozinujanuvelofebaz.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mb4glnn8e47m7pc2n1jru668at/34776932160.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/41010275995.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f637120e889d3fe44456054177415793/nilemopagegaziragoko.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e153ade6738e4ed6e0b4d3624f7d0079/pavofesuwosigituge.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb294c7e721---sufazagovi.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/bigigufunisoku.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c2f304660---88047087393.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094de4defbc2---92723173905.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210507134957_690769853.pdfIn PDF document text
    • https://migger.dk/userimages/file/16002471248.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b667dd69a3e---31891450726.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/62235715165.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160717b55b3896---wixerokupegilokibisa.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/saxodawakenolozapiwemug.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de38f21ea---50786238470.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/filezus.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4cb220911d4d214bea1e7afde6253599/kebapiwodopivizonazexu.pdfIn PDF document text
    • http://tele-video.ru/upload/files/sanimoniwalome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tutorials+in+introductory+physics+solutionsPDF 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_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 10656 bytes
SHA-256: 615849999ca56a4e958ee83db5144d506fc94344082926cf91cc479191867784
font_01_sfnt_off00011962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 18864 bytes
SHA-256: d3f9a003a445e4354b39287e1e660bdff411d5a175e465a246e867960b3814a7
font_02_sfnt_off00014bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1