Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a9ee0fe9692af7…

MALICIOUS

PDF

86.8 KB Created: 2021-07-01 00:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6457888b93859af7278515a52d39de65 SHA-1: da12a6dc4f0e20b617f666049a0350f3b9c1f3b7 SHA-256: c4a9ee0fe9692af7ea13d000d7a8bd60d283665c3c5c3465c5ac58a33ce80a07
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/7rpecvo04ssbj97i6207qc4h61/godegiwitu.pdf
    • http://studiospazioambiente.it/userfiles/files/69606483654.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/o4ldn355q0jng6mbqh3hm2ju5l/55896123528.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e3b7db2a2237f814c555703e5efa41cf/wizozo.pdf
    • http://alemotta.com/resources/original/file/98682327233.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/67ac2ae18c691598f19fcad224043ae8/55909234862.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/5c5eda333b77875f62236e74fdc9349e/kesepur.pdf
    • http://suamayin.biz/userfiles/file/dutiwuwitisizikizuve.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4cd46f7d54ececb404b3461bac02bc1f/35589858317.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a153e4a8e4f---guxusebinolifuxafu.pdf
    • http://dichvutheapec.com/upload/FCK/file/58693497545.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084681504821---fizolov.pdf
    • https://0a3exp.com/upfiles/editor/files/rikonelamezas.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b5a1ee50e64584be6c8d66bb7471e8ec/jameguwemenonukeri.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090047504dae---lunezejimetevitujomujog.pdf
    • http://abwrichmond.com/uploads/files/98780891975.pdf
    • https://nestuby.com/userfiles/file/powavuworalavupovimare.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7d87fbe94e094f307eddcd414b0701fd/zowawugavumigibobome.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af18091863---96458054460.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/695fe56e2051a8e6f02ed3cad513facd/42721434282.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ff5a0251e---52912119125.pdf
    • https://festival.bg/fckeditorfiles/file/62112392110.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/456e397ab06d828f1e9646982c2fa29f/porelorowejotiwo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=retacnyl+before+and+after
    • 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_off0000f1da.bin
6ff72bca0174069286c57f0c6efdf96813f22135f8e268772cc4e141b03c0e13
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 17056 bytes
font_01_sfnt_off00011de8.bin
3ecf3800168ba8f7f1dd81e8bf4674d3feb24c24e6eaa672a4fb9a18f3bbe51f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE8 10508 bytes
font_02_sfnt_off00013601.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13601 16792 bytes