Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56081801e9f2c55…

MALICIOUS

PDF

92.7 KB Created: 2021-07-23 21:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06094be9663607f1f2ac4dce47873c11 SHA-1: e2bf7c3d5ba6ed829c9907b9214a1ee502dbfe64 SHA-256: d56081801e9f2c5559509e5f4d3e02805d025eaa828b2ba63b6ad6521b15d911
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/fefd0b635ae158f88d5d55faaf2334c8/nosefanugezafu.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ln5j1uvdgdml6co7pjfasgkg7s/razuxo.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/84305760135.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160927c99cddf6---kutojipetolenununega.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/82578311416.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/c2c544ab9918a9e79dff90f865cfd4a8/zusiganemijuderizo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086049b89e52---xosuruwusageke.pdfIn PDF document text
    • https://hoongnau.com/upload/files/18533985849.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/babegofopodedudabavugo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f559dd874b8---tazukikopakogafik.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/36678837134.pdfIn PDF document text
    • http://jar-ted.pl/file/tewefisiduvojida.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/meximofusux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608296f232c7d---jozimofudadiwininobepixa.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/87721890856.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/nogonadirulew.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba6e81f4fe---38088370656.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf80ef64f---68497225964.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf9a3172e---55831479559.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210615_180537.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/evdqn6qnrdqor24kbrk1mtqjh5/pipaletijamizomuxe.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/20085143952.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2a734504---divagi.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0dea5b7895c3223b8e48d60de6f8e6e9/bojevebugujarasarademit.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d44e828e2b395373d187276f15d65471/22719471672.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/takilamigale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kyss+mig+pelicula+completa+en+espa%C3%B1ol+latinoPDF 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_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_01_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 18468 bytes
SHA-256: 4bfa1afae5308512ffaa39c2e2a50ceeed567f7a397a3944f7e8727cafecf89e
font_02_sfnt_off00012f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F31 11028 bytes
SHA-256: 746bc1ed586ac81ffa8cd964370f38c17818bec2ddc09b4b3ef98f4d2b9ee65e
font_03_sfnt_off0001489a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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