Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee259aec38c6de2…

MALICIOUS

PDF

86.0 KB Created: 2021-08-13 05:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f88332c6fdc2531b1824c76d56614c3 SHA-1: 51e3b3f12db02e165c31dbd0d129b3d72f905028 SHA-256: 2ee259aec38c6de2ebe7a55454b34745dda97c6c92af7dde6d78791d58ff6c1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics (PDF_SEO_DISPOSABLE_LINK_FARM, PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM) strongly suggest this document is part of a phishing or malware distribution campaign, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://stark-tools.ru/images/uploaded/paxodazikidurojofi.pdf In PDF document text
    • http://ibshop.gr/uploads/_uploads/files/40660088699.pdfIn PDF document text
    • http://ahchala.com/img/file/21575494679.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/7108997122.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/vejajur.pdfIn PDF document text
    • http://bacviettech.vn/userfiles/file/70897430850.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/xetudigimive.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/5kerkj0taj9so3rbc2ril6uh5i/varisorabiwizukarisepago.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a469b8db7ba---32854459803.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a358f2311---78359605505.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/55279035244.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2b7d258217a5e89d4eed2d18d9d253d1/34269617740.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/1ekhk2533f6mqiut007eg5tf1o/mifagodetumimin.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/zexexupapinet.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/8c4f0add8e0f286dda73a68a1cc14270/62707995586.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/dcbd9b3c7e1b5d43bbd4d74ed9d2243e/zujezex.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789331134b0---fezusilezexeveb.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/25474796234.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090463278e51---vofapokulolatomijabuko.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/bafokezojedesivo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb41e219e---luvubabud.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/faxoxuvi.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78a5de1a1---genopudanaxujufewasusuw.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/jaris.pdfIn PDF document text
    • http://kccmaul.com/files/files/netofexebixafipegazifonav.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/lifugifut.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/torixazelakokirereba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=math+olympiad+sample+questions+grade+5+pdfPDF 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_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 11432 bytes
SHA-256: 7b9f4a82fd6faf1606394f578d93424d72b08cff9f76f8452ed5e1c8dcdcc2c6
font_02_sfnt_off00011df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF6 16764 bytes
SHA-256: 74951008aa81d13fdb0dfd3cbf2fcce0b7d8a6243363b418e242e1ff66a3ec13

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