Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86dc23a2435abea…

MALICIOUS

PDF

93.6 KB Created: 2021-08-11 09:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d570ea00d412cb4f96d0a51cb31879c3 SHA-1: 5df75743f8522004bef43aff942bf8b70bdb39e9 SHA-256: c86dc23a2435abea61c00229408fa90fc035f3c2d16f29da6f51c818370d3323
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to multiple disposable hosts, some of which are compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as software. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://phantasos.org/userfiles/file/wufotugod.pdf In PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/69144038249.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/xaxuxoponejovapomewokat.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/topiputexiwi.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/fowinevabilo.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d422f73f907529fb3c8cbf13ab774f01/97674154823.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/sefitajifunibudosax.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/fazejuzipofovug.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/wesujufumikavorubu.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210723_F5573567650ABFE8.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b451ca1035f---ribinepetak.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b059d817aec---xufenezapogogutap.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/3ce66c218486c3793e32f52ec44bdd60/81116462746.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6e0b55d6a---ledibezo.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/11918085822.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608289f152fe2---jetekazoriro.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd29934d7---5791562767.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f82cfe65346---12509934170.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/sujokozozil.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/57487714706.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/raperufadativike.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a158ee1920---81239637889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+sony+vegas+pro+11+32+bit+full+version+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_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 11524 bytes
SHA-256: 4e0920e60840a7b4ac663a34703907f48372bc92184f9a72ce21d5e4dcca336e
font_01_sfnt_off00011dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 19276 bytes
SHA-256: b80c95f63e049af86c11cc140f6d03a32b5db8422a91bdda31552b932bd17e47
font_02_sfnt_off00014ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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