Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea04b1d1d9486e5…

MALICIOUS

PDF

94.2 KB Created: 2021-07-02 00:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a7b1f4feccc1fe3effe3345a54eb624b SHA-1: aba0256052e13a3f68009551ca6143495a2d8504 SHA-256: 6ea04b1d1d9486e5644649661d96b87080ea1904e4ca26f7aa124edc002463e1
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

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 https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a83579c6fe6---93475229144.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1337098959---tuvoxewizipobefakibo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aebaf28e712---bokemakutumizetof.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/abbf84916303239c12e59994c163565b/jokinuxe.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf9a3172e---55831479559.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/21024369078.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/5761033839.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e0005d3d643e829c6c088d25a203df06/vedir.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/83261516305.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d136bd2293---wiwexekasatogaditil.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/6d57cbe7ec1fdc43f5e5ab01d88c2823/35012153549.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb98f3aa12---29248079133.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0d8c25524ab5fdbb5c297650e44c3a07/11151029723.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b663ea6ab37---7831860358.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ae9f2d750---letulexekavasujupavulara.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/pepubekuxuzavokamenobe.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///6665402282.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d83fb7a33fd9d5f988df5d622e9903a9/rewipebifuvapekovezez.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9a1372f7ea90a159c681d8d9150cb3a8/betusuzekutifawebutir.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160706fafa6b8a---senebebakupaziserekebigu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160942f7f433b3---pexodeve.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9463e6d9604a2909911bb37ca7a6b86/xunevirawuwawegonu.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/19222785950.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ed895f13e37cd6355cec90b07398c138/wepafitaxepafolorezuzig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hardening+and+narrowing+of+the+arteries+due+to+buildup+of+cholesterol+plaquesPDF 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_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001217a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 17300 bytes
SHA-256: 3d250c89d5937612bce7c2303cd0d3dfce4d4503349ea2b4f29dc9659a768523
font_02_sfnt_off00014e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4A 11364 bytes
SHA-256: db5df1965ba594aef3d6a90e1703ee5bd075f0e2d36b2904b01955afe9b163d4