Malicious PDF — malware analysis report

Static analysis result for SHA-256 4869fec4d0a4c26a…

MALICIOUS

PDF

89.4 KB Created: 2021-07-25 06:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 7f601c49d7843acccdd9b54067168c3a SHA-1: 461c461bfbc32d1db2da25457faada113e99f53e SHA-256: 4869fec4d0a4c26a1a98c8b7d5f4653b8059513a8a60cdcf0efffb147f2a72e0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a tactic to host malicious content or redirect users to phishing sites. The presence of a link farm on disposable hosting further supports a malicious intent to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d579b79478---nomiroma.pdf In PDF document text
    • http://augustaelectricalwork.com/editorData/file/85970715713.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/be84222982b50a889f52dea2ae3c7115/94797758560.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160958854b71c9---rataropi.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849b1b55763---38115015641.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417dbec48c---65801406748.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/35989225130.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/62242875078.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083e5ae5a4ec---xunabajamusenedupetogoli.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/geterovixumofejorodubixe.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d32634cb---giruxiv.pdfIn PDF document text
    • https://vestol.bg/files/file/muzimuwisusulofepe.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080b66e7353e---30655689378.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/e447c053089cafc1df8398fbb1eaea87/jisanimuvox.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/zugarot.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/vakavali.pdfIn PDF document text
    • https://loctra.net/userfiles/file/63161577641.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8fa4b11b9bd953e69480cc025be3ff96/lalanutofapiso.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/vemukenikovagopasonedovup.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/jeduvanujuvib.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/44hblatg6d5v67htulg0o4dlr6/refavurilefulobekazuvaf.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/nerigafuxuvibufu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8148033245---xobovonululezojebasado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fizikokimya+ders+notlar%C4%B1+gazlarPDF 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_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 20056 bytes
SHA-256: 4c4b539cc1ccba083937556516f2394121007586ffa9aadbbaf7195742489a49
font_01_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE6 10880 bytes
SHA-256: 408e3957255ccf40a74acd82d82c2646fa62bbe8aabde8e96dd5ca031cb5e442

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