Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8ee0a7d1677f9a…

MALICIOUS

PDF

87.0 KB Created: 2021-09-14 08:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75f03035b2d3a92cc97725c6db335939 SHA-1: 8715ac9836438d01f6304d9c372a807cfb5c9325 SHA-256: 6b8ee0a7d1677f9a0bf96045e1e9ffe2ae1bb5066373055a5028d2dbd97a222c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users, with ClamAV and ML classifiers flagging it as malicious phishing content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d94a0ba62---32653466479.pdf In PDF document text
    • http://www.europesolidaire.eu/userfiles/files/sasimamopudaposudusa.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134a6bbb8e48---roditenige.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/35495049988.pdfIn PDF document text
    • http://ccshecea.org/upload/files/36541618493.pdfIn PDF document text
    • http://e-sportis.com/images/upload/2883120505.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/84416227105.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/niraforoxekotitijerazir.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/monavekizofo.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/56198010192.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/kumagorevumemup.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/b4f956acb75a3cbf1f86d1e8697d792c/jatalixepa.pdfIn PDF document text
    • http://gewald.ru/content/Files/sutirafigekukadapamo.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/gevekonoxezejizuzu.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/xiliridugamedig.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139794d9130c---pepigudirede.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/sejivumuvuwejazexenol.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/tuzevofevenukun.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/mutewe.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/vuvebitovafebaw.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/g4rrd19t77mcvmcoteou0rp9cg/tidalo.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/pobepuvibuzafotuvojolu.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/juberiwovarebide.pdfIn PDF document text
    • https://deepex.hu/hirek/files/4391155599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=play+time+1995+full+movie+watch+online+freePDF link annotation
    • 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_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 11156 bytes
SHA-256: 535b5921755f1f4044cfa50d8635f20380ab69d7fae0c5ca08dbf0b3e2ea94eb
font_02_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 18216 bytes
SHA-256: 36b364cf3aaaf03194bf44326d724cd0fb14463795b31af55f18ed2d246d5efd