Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aef40625be3a448…

MALICIOUS

PDF

92.5 KB Created: 2021-08-18 17:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aac5e4315595fdb2dfe9a4d4656e9f64 SHA-1: ca4b4be5d05782545199facd7508fa6c5a17058a SHA-256: 9aef40625be3a448063013346394db52d7f810c553c12efec898ad8971824c44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to lure users to malicious content. The presence of external URIs and link farms indicates an attempt to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://pavillonwohlen.ch/userfiles/files/76729447508.pdf In PDF document text
    • http://geteffective.biz/uploadfiles/file/zokokirivuwawebovazisov.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3df48e2f55---8600017753.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/wageviza.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nagipadimarawe.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/17324425927.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/budidivesenep.pdfIn PDF document text
    • https://grouptm2.com/contents//files/pimon.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/bijubam.pdfIn PDF document text
    • http://momsystem.ru/public/file/sazufu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5c57827909b90b485a431a81760fa8c9/balodexodotaseruxusur.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/cd15617516a5962a716aff4f552a217f/68929448672.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/fuxigurojivuwofiravorirul.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/toldbfhr52cjksql0scvl471j2/razakanipe.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ff423e888---xubekera.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5f05ead6---lidezemeti.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6243ee399383f35ccea2eb128d876524/15816268875.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/nomisadoburitikero.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1f6a636e---97097509732.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c5b9edaed---14914381974.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210517035809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tresanti+47+adjustable+height+desk+assembly+instructionsPDF link annotation
    • http://irodori.kir.jp/files/file/dujedifupine.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 18560 bytes
SHA-256: e6d48b720eee839dcfca612cff2e1640334bcdd60ef06222a4c57366c43782a9
font_02_sfnt_off000148d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D3 11484 bytes
SHA-256: aa46e6c94ea4e11c62b24b04c29637193400079e44d288bbd2cf5702298173dd