Malicious PDF — malware analysis report

Static analysis result for SHA-256 5490e93814328b75…

MALICIOUS

PDF

86.9 KB Created: 2021-07-16 21:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f59ae1d4f252bf320b5ce7c05137220b SHA-1: d7cb3920a4622de46612c06b3efee896909b40d7 SHA-256: 5490e93814328b75b018803b1df99387743ec8843b05dd17d8c8f09c00399b2a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7747e74625f8f66c5ce2baf10a947490/simoxovivizisepope.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/l6eo951mlqtba9guq018cfcomf/fewisekeluwinarasif.pdf
    • http://ottotech.center/userfiles/file/25550121647.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/51a583c32d9b0a08b4e5bff3b9dac524/gidekitajonowijinanutob.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/01018f2d40500ced875c7cad785814cb/64353598359.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766560a5aae---wipesipozosimugorarudir.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5612f4e7eeb567c360a090c971816bba/xifexulujaxobepiwejonuxos.pdf
    • http://imbirimbir.ru/files/xugaz.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca60228a1---38608288427.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607158f08cbac---pubogopopubiwep.pdf
    • http://budka39.ru/files/vijalumomedexumoweji.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ver1eijpmeubnl38f29hck113g/65961310939.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765cd1d9a98---87201726407.pdf
    • http://didocrosby.com/imagenes/file/71673217575.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160758b2ca3eee---58289193290.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aabea3e01c5---felazijegijizux.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec45ceaf51c---gawunewiwadaz.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f3a6212c8be683d5492f6efda60daaec/nexobonulamuretut.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/cdb9aece0559cfe8359bb8c3911db3ab/pijojulusopedonuba.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-16/20210516233918471331.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076499b11b37---56815837321.pdf
    • http://apexnepaltravel.com/userfiles/file/49677522601.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=embroidery+stitch+types
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f190.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 16792 bytes
font_01_sfnt_off000109a2.bin
5e999f9d2d13bd903513d2040b1894d191e71e1fa2de9bda80854641d1aa0906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 16696 bytes
font_02_sfnt_off000134ad.bin
004d9a40493fa6fa143c5526dcc2c0288119ef4ee906910938b085cf577ea816		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134AD 10704 bytes

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