Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0e947c7e7d56bb…

MALICIOUS

PDF

83.8 KB Created: 2021-06-28 09:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: edd996079fe06293a7779e8dc56a49e8 SHA-1: 7a32530203f2ab2258c9f8900c28d9f773f5c1d4 SHA-256: ac0e947c7e7d56bb97135616e34bd70079f727904349cd0d350678d69a876161
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to host malicious files. The presence of a 'download' button lure further supports this. ClamAV detection and ML classification confirm the malicious nature of the document, likely serving as a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://studioriggio.it/userfiles/files/jubupupipivib.pdf In PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7ee8c7ef4---65497933100.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d3a49c18f---fuzugutidunudu.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/93306127054.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5e1f285a---zexalozuletotuzow.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mlq05she7fcefrb91je7hh1ovr/poxizalasovepanitinuja.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829f7aaea3f---renen.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/foratemesababuru.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/fuvekutenunukaxenadi.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/vekesoxese.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/185ba7eb875daf350d81b6d987891528/zudetavobijetidilovelura.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pp1qhepjd04jpipcj9tj4ocn37/40126873157.pdfIn PDF document text
    • https://brod-plovdiv.com/images/wogudefilapesomege.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/asowejemorarupixerukawok.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808a3204265---xuludeninijiganosopafevo.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883ff54cae9---47569190011.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/64493209891.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a95ef9aa537669e46c833327ac593197/gesavenas.pdfIn PDF document text
    • https://olterus.info/contents//files/zunibukenalodipakaz.pdfIn PDF document text
    • http://altinay-law.com/images/file/61606305867.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af8142a48c8456c933425c72b489925e/18240132860.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/858d9cd5ba85ad254f1c6a4c20b52481/dilunazalogedaxojozuwer.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/9c2194a4ef60f6aeb933655861d3154e/xupisivef.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510183535812574.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/dukovufuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+game+age+of+empires+2PDF 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_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 18736 bytes
SHA-256: ebc931aac72d47f041bc75e46a527cf37695a343f796f549ec22e3cae2314614
font_01_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 10952 bytes
SHA-256: 463107d01c0f3ead2f23a8bd0d0a59b00c322a7163e93b38bf765ace6ec31143
font_02_sfnt_off0001282e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1