Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ce7a6e1caa3885…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 11:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 353fee52ca1d9f316427e4fc42475081 SHA-1: 8f01e95d2239ecf3e30da5b32a5507c444129ef4 SHA-256: 44ce7a6e1caa38857877c991a4c5d63a031e963c618a93c5ced37816fa012529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links pointing to websites that appear to be compromised WordPress installations. These links are likely intended to lure users to malicious sites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16117e9146785f---lifotagezofivikobagafo.pdf In PDF document text
    • http://hndgyl.com/v15/Upload/file/20218311926559815.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2461529ea1---30533367972.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d9fa7107---titefopepevasonuni.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607702257d7e5---27844732535.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/rubuxonozatobojuweb.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/fofusozaja.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088727be6302---jetogunipibofobaz.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/66728205622.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/luzokewevuwupowitovetixa.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/dq6htf6dbh69k6p2hl8abnq285/28254232995.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79ec9f5ec---zebepeximibomajokoxipibef.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216206562944.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/14721132735.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/furajusosaledavamuluxa.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/sixakoz.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/32268391704.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0bd14cbd2---pawidif.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/92497609486.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/nuredobemadofig.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/b4srb57jmiml9rnqkjpjbaln0u/piwerexibalosesaliku.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/buvemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=days+of+wine+and+roses+lead+sheet+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 19156 bytes
SHA-256: 958cd601884ec19d501b853e47f114d6b2bf9b3634573971eb5cb4b6206c27c3
font_02_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 10796 bytes
SHA-256: 9e422020f99656ccda520ff0f88d07fad2e07c103b64e42705c768bd50626a41

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