Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c6a1b10901ab89…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 00:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 089beecce703350e6ca712ce195eac82 SHA-1: d8c842888e830cde5953cc39ad6ec13b957f28da SHA-256: 84c6a1b10901ab897398f4059580d9df4b2b4a0c6dbd9cd3c74dcf8a28eb80f7
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to various compromised websites, likely intended to trick users into downloading further malicious content. The presence of multiple links on disposable or compromised hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://princeverma.in/uploads/files/mokivabedoratisifoz.pdf In PDF document text
    • http://otoozevran.com/resimler/files/zodikabobe.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/peratake.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2cfa56ba---xigewevuxudifuxuzode.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cmq4701ea0hulgveuq074icgv4/66269137647.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e987304bfe---xetoroxiwowibamemajoluwuf.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/050ccffc9a3298112a55a1587d49b8b0/tujakiwiwujadoxejof.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/42a61aa59697a0bb7321338e8632e712/xonigikizad.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/61917254821.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/65788138998.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/mavibu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f50447a7---patiwozupo.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/gulevodogudanasexamifesu.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/23911902990.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/93883465501.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/17798027982.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/fonimiwuramunurarikotoxiz.pdfIn PDF document text
    • http://buyout8.com/asset/uploads/files/15583918967.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/mumarovak.pdfIn PDF document text
    • https://peterdegendt.be/file/givusenanere.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/piwizezupuveribuk.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/tifapiraxuw.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/76736884556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=contract+non+renewal+letter+to+employerPDF 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_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 16760 bytes
SHA-256: dfb95cbc409daff52fe8ef0fd7cff9935ba225962daf540e6f1df3213a0c6b62
font_01_sfnt_off000118cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CF 10504 bytes
SHA-256: fb97da2c94eb861d923ef69c4073f9c896cc428de63667d6d50a5f337b94cf91
font_02_sfnt_off000130d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1