Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd3d8587b4e173b…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 13:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41b61b96553620dbbf6899bfc82199e7 SHA-1: 470070466f421ea07e7ab362168e4eb2b6fe267c SHA-256: 0bd3d8587b4e173bd957bc4ae46ac270d8fc08cdbc9b649b0f793c7796ada802
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://srsheicha.com/uploadfile/file/54562655019.pdf In PDF document text
    • http://holidayservicemarsala.it/userfiles/files/wekogizudolibuli.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16125ae8f6ee4c---wivezenizuva.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/99509835656.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7mqt22v6ff9ecnqtrb39oqmj55/witupuwezefuwabede.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/fumapafanajeriwufozo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d3e1c1f2d---34540981137.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/2053444063.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/4517942969.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/33481202518.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/mudukojifovaxidalexubo.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/53330366786.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/18635331919.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a26d3f73fa8---muwekapufalaxowunegupoxil.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134278bc6ea1---mixobolejuwukib.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9a494d3ce1acd0e02a854062de06836/62186966478.pdfIn PDF document text
    • http://elitvorota.ru/f/file/tikoturekajegikene.pdfIn PDF document text
    • http://starma.pl/files/file/polidim.pdfIn PDF document text
    • http://goref.ru/files/file/zojerokopodakilesud.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/jotosejuxemodiwijavejele.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/c4f7080730a8fc1a2bdc2ee8843dd564/74625630554.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/7jaohdfdm4r2hp1tcje3nu4vfp/93558365279.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/907148a4ff1461aa61ea865a40badd47/ragowirolufegejedezovo.pdfIn PDF document text
    • https://digireg.pl/upload/saletefunetozaluba.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c5c5210ba---82293454190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=konica+pop+camera+manualPDF 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_off0000bf69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD780 10360 bytes
SHA-256: bf2a265c7c7130ebff895a52092e10eb16d44bd31612ef983db1395f4440bf6a
font_02_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 18668 bytes
SHA-256: 856087dc35b06c32faee6196d05d6e5a5c791d62aa40ff652073d9ff66dc91f4