Malicious PDF — malware analysis report

Static analysis result for SHA-256 184d3d092507fa21…

MALICIOUS

PDF

80.2 KB Created: 2021-08-11 03:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 224c59be468d7e5bac81e0bbab382312 SHA-1: 5104c5b3918fab363181c229f955db5a137f1946 SHA-256: 184d3d092507fa216438e6235e6995f5e2f5dbe6cc9f2316081e59008dd04011
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule suggest the primary purpose is to redirect users, likely as part of a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://radissonhoteltraining.com/userfiles/file/vadikadafopukimodowu.pdf In PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/gorubazuxulelukesuke.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/634c83c6ac502e650cad462f154cfed3/gosibolizutu.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/fuzoluken.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/xalope.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/torafotaziwox.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/aa7fgcnulcph6lgqhmnjp7cld4/75144059455.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3bd844ca---nupojiv.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/7pj98t4nltd4cprdali6cf1l1c/mizokori.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160de71db15545---61211282830.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/piganupiza.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/11919736379.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/rukumogiwofebudoj.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/22396072548.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/180227050d852f9fb3c55bad6f35e701/gobajagefaziwiwuzenibive.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e762c60263---56312083125.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bd78235df---25420771169.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d00183f55---94183371961.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b5f4e2459bb17c0d0cbd6424aad0cc4d/24747375805.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e27e3b9a939a3bcf4e2106286482c352/16647392881.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/duwutojujenudi.pdfIn PDF document text
    • https://inncredel.com/uploads/37180058954.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/55566549613.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcaad46626---33785968504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=michael+r+solomon+consumer+behavior+12th+edition+pdf+freePDF 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_off0000d299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 11356 bytes
SHA-256: 5dbf5c685f294d152cc25ff65edaba99044358653757f21c0f5b6b97b257c4f9
font_02_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 16960 bytes
SHA-256: 40d57f448f1bcbf469c6584ff0541cf9a3d77b10c758da304cdb50f72483caf4

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