Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2845703f2ef3e3…

MALICIOUS

PDF

93.7 KB Created: 2021-08-18 23:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5669c1a0d27957b644d2fff2eb6d5c87 SHA-1: 0c220d44be98ad5f7b59cc3ef5c134ace0aa1e94 SHA-256: 2c2845703f2ef3e3b606b29091caf5a19a6aedf16a03113725d6bda4f899a7b5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://youngthisyear.com/ckfinder/userfiles/files/xeboropurenofus.pdf In PDF document text
    • https://matrainagycsalados.hu/userfiles/file/mibekuferojovabape.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/180c7e951d0eb91c8ba8f059dc450ba3/jelemukeraramakelib.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/xarijogofik.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/a4q0taskdlatobv9aca5lgf623/liwefofuwibevomupewekub.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/gagazutivididagewunod.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/17406339198.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/18437159829.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607497f2a4546---xosifaxiwe.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/48310647249.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/p2caes6rnr30mrkl5nd0uvllui/nusaxo.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/siluzimizeva.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/834152764.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada887337ec---78373653067.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/kesotadegatixur.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ebaed7617---kobot.pdfIn PDF document text
    • http://www.bandungmesin.com/file/59891023349.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16100abc364327---tunofidenune.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/gufuvoxu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a67a481e7e9b24fe54e20505cb764a82/70822189391.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/6785865483.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28270a8836---38605696576.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417130e0a6---82729647118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=contabilidad+de+costos+jaime+ortega+pereiraPDF 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_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 18208 bytes
SHA-256: c36b95359bf09d4df020dc8eebd639c5062d6040946ebcb892a5a6880aa17855
font_01_sfnt_off000134cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE2 11156 bytes
SHA-256: 6bf183f1fdb415fb09f4655de91c84699eb90d06640e8cb486050925ae28073a

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