Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35fede6680e9ad3…

MALICIOUS

PDF

74.9 KB Created: 2021-10-07 17:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7b9516d9a152c6125dc3da09b54f308e SHA-1: eef4a1d0e02891bd6b2f2a3df26b9010ca6c1b93 SHA-256: a35fede6680e9ad3451957f3562566792292a56ac65392e3dd6efd2ebac45215
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and ML classifiers, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6548

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 https://allytemp.ru/uplcv?utm_term=hormones+released+by+the+pituitary+gland PDF link annotation
    • http://lehnerkom.de/images/uploaded/file/zamijozetonurufew.pdfIn PDF document text
    • http://tdbm.vn/upload/files/51068944205.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/jekuvovijagolig.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/zagagire.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/kafena.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090501381196.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/dinefan.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/7479510978.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/78320730557.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/bojakededib.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/narutibajosenisofeku.pdfIn PDF document text
    • https://biocoils.com/img/file/zoxigizafebozikado.pdfIn PDF document text
    • http://klinok-saintp.ru/files/zejib.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/22652887123.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/nixikejedetosa.pdfIn PDF document text
    • https://kermanrooz.com/img/files/xasavabosututuvigif.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/nupoganifuk.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/zedurutol.pdfIn PDF document text
    • http://annabarons.lv/files/files/86270963861.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/41554500710.pdfIn PDF document text
    • http://mojaksiegowa.net/userfiles/file/17747928010.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615bebf85362a---ralovafodo.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/49848286933.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9c95817431889dc9b3abc6bf257e649c/93987405609.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/667a729da893f822d1d57ff654c0c1e1/lerijiren.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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