Malicious PDF — malware analysis report

Static analysis result for SHA-256 6640561a60e6f06c…

MALICIOUS

PDF

159.1 KB Created: 2021-06-27 22:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5f171a7e4fffd5146da272a7c4236e97 SHA-1: aa53cda6b5aac3e6781b8cd1cfbb0b920400ea01 SHA-256: 6640561a60e6f06ce0709b91223de12a07e604d71c14dbbdac93d79809273d0f
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 phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada04ae9ebb---wekikarojud.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9bb540129e7ed4861c94580dcec7436c/kovubinosolesesupala.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/43725304343.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/96949811525.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/kosekusisovuredesorip.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/36202650252.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/bimujokazobat.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16076343cdcd12---7591597101.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/wosar.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/5dd3789ee0f1f9283791ef42fab6549e/46126901885.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a23eb33c1---joxuved.pdfIn PDF document text
    • https://dm288.rs/slicice/file/wajureroxegazemuvave.pdfIn PDF document text
    • http://www.toptehnik.si/images/16795449194.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/lewelimowujozulufesof.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/migirodow.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/66149896320.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d5df057e---76500923131.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f9007d645---87847866381.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/siparatitepuluwefug.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6eeb7868b4cd9a7051fc08283df000b1/4456593012.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c45674ec30a---47570807204.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/h12fi84vb9puk0plf9t8mc7hbt/zomodogeje.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072104cd6df6---40460273709.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d1d938edb---57706705976.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f09110300---vatenizatefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=use+case+diagram+exercises+and+solutions+pdfPDF 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_off0001f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7AA 17764 bytes
SHA-256: 913d634d9f1c49d5177bc0514c6787f047566cfb9af7b4aab6fe9280ddfcf58f
font_01_sfnt_off0002266a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2266A 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
font_02_sfnt_off00023bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23BC3 11172 bytes
SHA-256: 7c7a729cc2a00542fdd6d43f9be647599043798b87cc0298835a029434d77588
font_03_sfnt_off000255af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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