Malicious PDF — malware analysis report

Static analysis result for SHA-256 959b289a7f61284f…

MALICIOUS

PDF

127.5 KB Created: 2021-08-03 04:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f3a1e47885830fbba026ca05a21b49c SHA-1: 6765bdf3c3da3ada4d170e4be26708f5d2b136a6 SHA-256: 959b289a7f61284f85f08f74952c25418305c58731d44b187a0438f8d22881a2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites, likely to host or redirect to further malicious content. The primary attack pattern observed is the use of a link farm within a PDF to lure users to external, potentially compromised, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f0a8c84da7cfdaab65a874195994eeca/79359759846.pdf In PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/80525579478.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610449c34d636---mefofizinilijo.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/5292968923.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bed4ca54e---99049352367.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/42f73520988ce92e6859150d64e896d9/2844595609.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e1543c724e665530d554eb31e7f0ee25/75733774707.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/lesopamudifokefubujukot.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/76512390414.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/wuroxebupifa.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/74777303499.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/4376853936.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/37721654605.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160884405f2cae---26853995279.pdfIn PDF document text
    • http://esistore.de/userfiles/file/5769681629.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ae23f3670---nabizedixawipopileguzifo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a8dd485a9---28896516673.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/cc73ab7600a71459883afc2e1afa13ee/pudosefefolosurosedobaro.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/43630883880.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/penepalosidoxazotebijalo.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///wesuxate.pdfIn PDF document text
    • https://tonitomov.com/picture/file/fegokotorizoruxomatoretu.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/mutoparozelelut.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078ddde6b115---xefevut.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21f168b547---mokizolurizoxivamosifedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sinais+clinicos+de+trombose+venosa+profundaPDF 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_off00018922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A134 21220 bytes
SHA-256: cb6371d87971a77cee1c59f64e1da13a858dd5996362c8f637359ff583171ccd
font_02_sfnt_off0001d46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D46A 11164 bytes
SHA-256: c69c637d2e3988e86d0dfc6e05fed7c038668bc8a0e8fc32a41263fff384ff2d

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