Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab03837de7a057c…

MALICIOUS

PDF

83.9 KB Created: 2021-07-28 07:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9f1f365d76738aee21e33697199156c1 SHA-1: a4bffabe0473b323feb00a4b08d25dcfb5443cb7 SHA-256: 3ab03837de7a057c9e9845b92717740d12fb39891f0f2e47741737c6c341651a
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links and the use of 'utm_term=download' suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8384

Heuristics 5

  • 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.
  • 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://conexusinternational.com/ckfinder/userfiles/file/natinurosig.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3c646b13a8e9976da352d7c1efc84a77/jakinadilisagafewop.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210609020849714308nf3l1b.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/c718d4fe6c5d98698fb0b90e0d580fbd/39984071423.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/fizadi.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6f0c9f9f9f59b754e17ccce64cd9370a/67829156779.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/banujefax.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/tiwapazifezoxanuwi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f350d9cf939d19a00cdc102a97210d58/6029663691.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a9c74bb81a75451e9fb0221684fcd492/1752106157.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/mezeretu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/96ff6c63d3e9a218056b530ec6ff0b1e/9908086907.pdfIn PDF document text
    • https://magatek.com/documents/file/zutesasinemopiwakajukup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ba7ad1e16---28220225312.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/a4bc9f1077cbdbac4324a750942aeb87/40190470269.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bb6cb496c256050a4d6f26d35f26e07b/39139552720.pdfIn PDF document text
    • https://irantruck.ir/data/file/sifujuvasifavexa.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9e5ce94ac77147c3e5381fd485f5a29f/xakuwekibijadelo.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/10590958846.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/tufudejanitamew.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16240964866589.pdfIn PDF document text
    • https://coatielectronica.com/files/gasofesogusumopopilusugu.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/foguzemusuxixesikawefa.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/42843112489.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ede007493a0---jadatapojaviwef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+android+apps+on+pc+without+bluestacksPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 16832 bytes
SHA-256: 3da4e1d7f771a9acb946891454462ecc968ef88761d71d907d8d5fb0fab84752
font_01_sfnt_off0001254b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1