Malicious PDF — malware analysis report

Static analysis result for SHA-256 619157c03077344d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 18:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 910ad8433e0c9e9db2c135a605cae893 SHA-1: 8f249c1d1fbc12e278b011524fae0a9398206d94 SHA-256: 619157c03077344dd4a3f9f7f3982a34d018d3b6e51d763fd1a1f57e7b56bbd0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure suggests it's intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6382

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://synerhu.ru/uplcv?utm_term=samtools+manual+sort PDF link annotation
    • https://rt-totaalafbouw.nl/userfiles/file/vadavatejukenerusutarofe.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/xevaturamefola.pdfIn PDF document text
    • http://tai-group.com/upload/files/6635716881.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc9c11408e---xevobojivisigisalevutudow.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/noterulefujevok.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/barosekilej.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9e43206385e9d87f6cb259b9b9f012f1/24105172438.pdfIn PDF document text
    • http://abnicum.com/files/file/mizenevudegelidirub.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/38a8a246bca95b252079893ff5c4dba7/nojagepu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06d03df52d---32130973599.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/vezovuwigigafu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161119d88bb16d---perijazowugipu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/veo84bc09gi5tg6t6r9popnhkv/60229633945.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815c518fdf7---terevedigepoguxet.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/zovafawiwasipakos.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/94516332052.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/zunuw.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/48017347000.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6f144a86835ed73a1351070dab1cda2d/jerabekoluwosuki.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/pikatisatodilawilubep.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3sv2aciqbpmhur0dfjn5vof9qv/pawexilobarebera.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/jexagawapuroji.pdfIn PDF document text
    • 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_off00011445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 10220 bytes
SHA-256: 3a1f7aaa04e0d9004302d480da68a4644349338e3d6a97847ab6a7be6487c4bb
font_01_sfnt_off00012b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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