Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fa7ef5fcaa740a…

MALICIOUS

PDF

90.7 KB Created: 2021-07-02 23:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0ef62c61468729bb9685e5f348bf3440 SHA-1: fef6a06f0caddb371c4db9020cc8e72ad6a36810 SHA-256: 84fa7ef5fcaa740add862359da5d7100e47f2f143d51e63d40a90d55dd5eb6c1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm. The presence of these links and the overall structure strongly indicate an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2ffc1aebc5a18ac01afde5a799ed8a61/36219629460.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d3e907423---70268216742.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/93a03cb2706442018b2151aa51f02289/44231277789.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/502510cf48a16fdcd056d78c9bb2e862/fapezafunitasovu.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/ditovori.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/95574256532.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/40893770513.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7f59dcf564de29b7355edb2f00bd317e/4205043893.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/lifagawizi.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/keveje.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/79244867579.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/48562569356.pdfIn PDF document text
    • http://iltorg.ru/upload/file/62405607895.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/62004cfdd80f99a1baaf9e9f8cfdfa2a/kasululed.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/8smdcf6t7933iacipk8mhcq9p4/26370258381.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/371ca2425d1fdb0ea8fde549f79fd59b/xuxebafexoragebopopev.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/widusulapu.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/46250915953.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be92e9bf623---72839101521.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/38569870934.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bca8aa4dfc5---82591341360.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba3a6e196---19985839144.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d448f7cc7e6b5c11e2f1c51c75d11b33/36389375606.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/54c3bb3487547180fc88b08cbf3ba34a/ruwemitufofovepufux.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080754f7d824---13736110021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=think+yourself+to+health+wealth+%26+happiness+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_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 10668 bytes
SHA-256: 662e249c6c16c8c4aebba87cb9a5c5e0f259526d74549794c56434557cc8d761
font_01_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 17980 bytes
SHA-256: dc85db082f298a82ffe3aa448015b3992e5e88d780f215e9d4fe5d10a32d1f5f
font_02_sfnt_off00014540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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