Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b2976263c20689…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 01:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68983418d09d8c37a815ef15216aadee SHA-1: 51099a7406d887585c591cbdfaa544947a905d51 SHA-256: 91b2976263c20689506f7664bf071c14d925edc4b5b1e8cdfeb7563659c33cef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The primary attack pattern involves directing users to these compromised hosts, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ee29a3003bebb2f9c2a439bb2adf3e25/dovumixu.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/72139e8f0b068ad3de6de000798949f5/77440386331.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/80391ee8c08ef219e05a6e9639cfec95/94174491098.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/59cd70d915fa6728ad8109e1236fb355/94523255347.pdf
    • https://starwebline.com/calisma2/files/uploads/karedesutepifute.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4dd1cb4536---7054002413.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607554d636479---1904467296.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rjfeass9de85ejekddtqlduns4/muverasuxaz.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xirivupexekidawawute.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/68890250766.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe8f935fc---savavibefuduzoronilodus.pdf
    • http://bycongroup.com/UserFiles/file/30482728312.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54fef61003---zojugokasalijadoseme.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/50c987e2de64123176254d388099a632/vesaxosojome.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a6995bd30e13bb9df937ca71bc99a78b/jegimemezujoxaririd.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160931c4d7bfbc---86268114338.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/0cojbkj2k3dqs5mamui4pirdg9/49312577844.pdf
    • https://dailyhondaotomientay.com/upload/files/28470365694.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be7cdf396cf---29711213427.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e4048a7967122011d229aecedb2d95e5/lesuxuwifeposikudegafaxu.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e6e623d6c---tilerasedomunagesuf.pdf
    • http://vejwun.cz/images/29048065548.pdf
    • https://chaplains-camps.org/upload_picture/file/mitimufukufijovudesa.pdf
    • http://bannails.com/fckeditor_userfiles/file/kulurivajis.pdf
    • http://alemotta.com/resources/original/file/zuxowo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ramstein+air+force+base
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f371.bin
10db034483fdd674ca583431bc270b751a65c3baa3a016489e35ac09de9c46d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 17172 bytes
font_01_sfnt_off00012059.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12059 16792 bytes
font_02_sfnt_off00013870.bin
944a886fbc04c977eaac25117f038e7175e46a6c568d01478921b5c2bdc9c71c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13870 10636 bytes

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