Malicious PDF — malware analysis report

Static analysis result for SHA-256 c722230c82d02836…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 05:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27e7fcc32807912226d0b6ce3918bfca SHA-1: 0256d854362864f310c7d099bcf917b179f90ee8 SHA-256: c722230c82d0283655c7592a285c0326d4e1e295d85db2ee6742313f55d70fd3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pensjonatagat.pl/userfiles/file/bapepujulebi.pdf In PDF document text
    • http://weldingplaza.com/files/file/xivigavosededipodokunezog.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/19471834995.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/84759787679.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/12756334217.pdfIn PDF document text
    • http://ave-france.com/pics/files/52742848426.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/72948986868.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/45351280155.pdfIn PDF document text
    • http://fabtur.ru/upload/files/93129092011.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/60916916083.pdfIn PDF document text
    • http://thedreams.cz/files/julijafiporo.pdfIn PDF document text
    • https://hse.tw/upload/file/fuwon.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b668d79732---ditomoju.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/meboterusapiwa.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/vejuwumelikawalesimelapot.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210706085544_nawk49.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/19892990391.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/71494608751.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ff65ccc21---45467405562.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/58hhfq4mspuplhg082cbk25bs7/jarabuvodageju.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/24862782696.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/fogevobukon.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/89051704909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=amazon+kindle+fire+hd+7+manual+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_off0000d314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 19572 bytes
SHA-256: 1a600fb48fc8ac2f28197c2118bf5c1cac3bf0876d1b731c1cda09df501bbc5c
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 10780 bytes
SHA-256: 7b428e25e18ba3cad72b1dcbd246851adb8ae7e72d8201b5508f503740c241cb
font_02_sfnt_off00011e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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