Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4eb7fccb858a003…

MALICIOUS

PDF

88.2 KB Created: 2021-09-13 00:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79f34abea2aaec5c4602495c73d2bdc2 SHA-1: 6ba9842ec4c069dfc186250c62e84d429783e662 SHA-256: b4eb7fccb858a0031f0ad96c64761d2e0bdde45ed7eaef8a6abf34437260b9d8
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document's structure and URL distribution align with tactics used to obscure malicious destinations.

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://am-system.eu/ckfinder/userfiles/files/femabibotifu.pdf In PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/90395727687.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2uk9lipvr591o6nj9211ncsli5/83827001987.pdfIn PDF document text
    • https://stotex.rs/files/mobapelopadatepipamo.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/35407612019.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/62808841165.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/73638706085.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/26428784454.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/88973864168.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/sinebugabuwavinawe.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/suvidokudapo.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/sefokukexogu.pdfIn PDF document text
    • http://oodow.cn/upload/file/210905175345759060asob1rl4asgb.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/bugazodamutowovuj.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/20055054101.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/folatipiwuzawani.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/657f32aa5db55e4c52a46b26120c0be4/garugiriwuvegibamul.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/vumuborewedebigineko.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630942353274792041.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/nubudosamodevujalemitu.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/mitidav.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134406153d5e---37400488575.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a5b42cad524f26c5b1fc1ab8fec91518/vumogo.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/xepukixizipekanipigozum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=list+of+android+horror+gamesPDF 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_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 18208 bytes
SHA-256: 92f378bb91dd796f72d06a10dabfc265d97cf33ad7802bd51b045fe212f5cc5a
font_02_sfnt_off00013ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD3 10712 bytes
SHA-256: 6d44de8cd41d6261e33c9e606307b973985cef3608354e25a99967ca9096b356

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