Malicious PDF — malware analysis report

Static analysis result for SHA-256 4284e442cc5ba634…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 02:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3d20b0968c1681dc0d6b5e3e2ff3aad3 SHA-1: 3d806e2cc58efeaeb9d68e4419c6d4ad1c9a58df SHA-256: 4284e442cc5ba6348139992fc3036cf4056aa2acc681c439b8fad59bb135c3c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/90399181534.pdf In PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/gesokuz.pdfIn PDF document text
    • http://bakoca.hu/files/file/pineperanibow.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149838b1953a---xanadevukeseragisulufili.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/39861421813.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/noloziliboj.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/kudibarakobokewobafuba.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/kamaxevenorol.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/rozomuke.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e906826894---12170692345.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/gotelubusiposa.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/86295226071.pdfIn PDF document text
    • http://elpijisystem.com/file/48145239574.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/63167854077.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/zivagevafesapegobivepofab.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe75196594---ravobajasesiwere.pdfIn PDF document text
    • http://www.puhito.hu/uploads/zasawumumofave.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/15906123930.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/lomumadupivowatigepuwate.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/70302168154.pdfIn PDF document text
    • http://daliangluyinpeng.com/userfiles/file/zezasadedatox.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/93001521660.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/6978193692.pdfIn PDF document text
    • http://agrion.org/upload/fichier/44853386170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=d+and+d+5th+edition+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_off0000b1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DA 10416 bytes
SHA-256: 0b72e1a49d766631ad1272513e30b5b2fec66081580adb217b84e9f0cf518746
font_01_sfnt_off0000c962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 16356 bytes
SHA-256: d50840149c9d790afac398eec5b72ff51a1bbfca8b8c1ef13b40814f3da48d62