Malicious PDF — malware analysis report

Static analysis result for SHA-256 246d37650c7237d5…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 21:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c886f0a19ffd9db2b4309eb776d0eb41 SHA-1: f6636ef4fb4e5d8cc1a6371c2d51a4641017273f SHA-256: 246d37650c7237d5802e3e0c52a2129a45bc164082e39304ead2b615774a8aa0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing pages or download further malware. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests potential for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://xanbiente.de/userfiles/file/47056647196.pdf
    • http://euro-ex.net/images/blog//file/gadukozavepote.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ef9dd42dd---39941658335.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/04ed7ca3997fceb5b05c151447843d01/luwesifupowibesefijabari.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/t93e3sp6skn4750f2um6ibea2j/giwafelavovidamiwijon.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba3c5b405f---bewepekajozawesetuj.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7def7e0821f37e08058d9a30c9efc59/24365519959.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/5t106oc1nllla85c6fmaofi32g/94997685606.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adee7a1edc---11999983030.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/hssl432okhtcqev8v5or5h0867/golanisirupugojidi.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/j5p5s3k69fmafc86sk2cc80uoc/32443932045.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c091a1919ce---62941246267.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d3d659399e2906c4364ac4afa82b4898/67953664921.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebd229c2b8---50146055871.pdf
    • http://fine-cottage.ru/userfiles/files/mijobubijamowikuwafu.pdf
    • http://brlairport.com/images/file/togavuriw.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/18690801682.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160730571a68e7---7799300450.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7d3d4fa31.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/k7jkeosscks75h9uj5efpl9q8e/17070089166.pdf
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/xezanotavotitiwo.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52f8e73f0---walawamitupexixirixujegos.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b284afa7e8c---57829452932.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=four+sided+figure+is+called
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 16792 bytes
font_01_sfnt_off0000f300.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 16252 bytes
font_02_sfnt_off000108dc.bin
4ea8f0409af8f4d0af398c596c85e8714209da2406061d72f2f4359b69366d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 17928 bytes
font_03_sfnt_off00013773.bin
bb4e25e61cf8d6d9ce19eba79869aaec61eb970bc8060b14cb26c4c870f448bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13773 10524 bytes

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