Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf3b11f3f9d4c43…

MALICIOUS

PDF

83.2 KB Created: 2021-07-21 08:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 851d3087b269dab567bd2ec6d5b0a04b SHA-1: 5f5ed9d142343005e8c566c4a885bcfd8bd223d6 SHA-256: ddf3b11f3f9d4c435c35bded240754a3e6ff6adb004c8d3bbd0e1d2bbc71a61a
132 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. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.2404

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/148be56f986bee7beeff9d70269cdd40/lavul.pdf In PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebbb82877d---girevuzut.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ee21dc835cc---livakizusozozo.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/0o8ip0inp37cknnn7qvisc30a4/lozasanisoliz.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2023d6e700048f901d98ee965df2ea55/jamazebijun.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/13a22eecf51344693f9136d640a89f92/fipatije.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d7a001eb0---boxagazilatobejezigo.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/26388923088.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/61898507299.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/tbo245l04njh307jdab22s1vrl/43447321831.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/wisewidujirojid.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/ninimawiwivizizadebud.pdfIn PDF document text
    • https://le27.fr/docs/file/zijadivedepapitadu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608551eee5179---givowidujajejo.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/q4q13qkerupmg1h1ioape849kb/62159260218.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/bomimekujakifu.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/c7a61d6cf898c3c0900765d8ce8818d3/2886526306.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607182e2cab14---77207418481.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9444a9a2bf5ef1bb624590082c14433b/1197297157.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/kfqqhuuev74o6682nt8jn6fnk5/19493033374.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/jitojonefuramuzupi.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/kebokedutiwifofusatoziwu.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/86594767412.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cb1511f66---zugulasokujokolaraxolowe.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ced932b5a9b---purubopadopipuwug.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/32722921202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=i+miss+you+the+mostestPDF 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_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 10128 bytes
SHA-256: db044bd0318d81316d6d75f401cf27e57ed023da4849006aff9ca4db4ba6f21f
font_01_sfnt_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 17248 bytes
SHA-256: 7c18c681db1c8ebc0269e345e38b567ec972dd48dd3b3bf3ee5198609cb6f98a

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