Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd28caf914fafa2…

MALICIOUS

PDF

108.3 KB Created: 2021-08-27 08:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f78f068d813ce13ded166d5c61f602c SHA-1: 7662d0fd8456a51cf9c6b4146cfd0405b5e1a1cb SHA-256: 4dd28caf914fafa2a5d2e905cb80ea82fc796a571622fb58d55c5422dcd204c5
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/mirozexegopidenezafasi.pdf In PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/7868544484.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/metik.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/bolufiditarivametin.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/97cb1014506b6e6dbca6db8f5d9543dd/84885989366.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/13505918528.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fd3f99cc1351cde16113c54482a5931d/minudadepegu.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/62389288146.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861e674edae---36448150070.pdfIn PDF document text
    • http://precisao.org/files/files/97784759979.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/xotim.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/vanodur.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/paxisugurur.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b431ac702---72294932504.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021082411422265.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/1e7295d8467232e451359f4532c36de1/xetonavaxibowubut.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/ronuzufikugidomapadeliwe.pdfIn PDF document text
    • http://atek-ent.com/upload/file/dipuvolabu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d880a959a3f335211d6548190e0cb75a/xadipovugadagex.pdfIn PDF document text
    • http://arablift.net/userfiles/file/36145615362.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85fb5e63f668ec443239c3a07fa0b6f9/13960982172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+map+minecraft+pe+survivalPDF 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_off00014447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14447 17120 bytes
SHA-256: 7e49df9a93ec1012ffd685d2f39b8632dcc0757724789dc2c52f863f2f6a1968
font_01_sfnt_off000170c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C6 11036 bytes
SHA-256: 43f17e4275cb37f4dbec4ec9c371c180e99e72606873d409110f3b7b27227770
font_02_sfnt_off00018a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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