Malicious PDF — malware analysis report

Static analysis result for SHA-256 590754588b3d60d0…

MALICIOUS

PDF

114.9 KB Created: 2021-10-07 09:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 503afc7891b974f0a6716f70097133a7 SHA-1: 9844c504d447d60147e0a654d2cb47a7be1b7750 SHA-256: 590754588b3d60d0c20827e540cac5eb47ad3be5e0c2554d8d94fdff5dffc658
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting, forming a link farm. The primary function appears to be redirecting users through these links, likely to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://aznamaste.com/ckfinder/userfiles/files/wawiworideralojujigibuf.pdf In PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/fumojimejiporizip.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153ff4aac7c7---nelaxasagifojanimu.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/model.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614fce2873ac7---bugipujus.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/pumujawu.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/43849850745.pdfIn PDF document text
    • http://rc-modeller.se/images/file///98153917957.pdfIn PDF document text
    • http://budropol.de/Upload/file/motufiranun.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/gaxezitolufo.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210923_013405.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/38240072477.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/zavomumadipoveterar.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/98037037157.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161371abef20f2---lilunitekekutukegexok.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141efc74da22---55345231206.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/nufaveno.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/ruvenabejoguwekagagupituk.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/bomasev.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/bec517664ba920bb013087894a841e6b/22568940107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hydrolysis+rates+of+esters+lab+reportPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8A 21284 bytes
SHA-256: 87d06e9868bf0e82fb18136abe2704fa75dbbc4b0264a77c06ccd134d146db87
font_01_sfnt_off000176df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176DF 16384 bytes
SHA-256: fd26d661aebada70f2ab211cc9349a88a6b4004e9decbfd97b920bfd045c2c2f
font_02_sfnt_off00018d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A57A 10632 bytes
SHA-256: 9cabfad52451f45eb5f6ac96b043d6227227d048440104d8fe779499376bc146

Open this report in the interactive analyzer, or submit your own file for analysis.