Malicious PDF — malware analysis report

Static analysis result for SHA-256 801f1015a066cb31…

MALICIOUS

PDF

84.4 KB Created: 2021-09-23 01:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f77c94112c61c640fe11bc2a61842eff SHA-1: 48a2dd1815b02ece4d667d87515339217e79bb10 SHA-256: 801f1015a066cb3159bc0aa8e7045419fdd627a62345c92eae9fd4eb01367699
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file containing JavaScript actions and numerous embedded URLs. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://divyabodhanam.org/userfiles/file/30182876958.pdf In PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/94360335717.pdfIn PDF document text
    • https://tavio.ru/files/file/luwezigarelamuwunipanuf.pdfIn PDF document text
    • http://hanifeugur.com/image/files/buxagobu.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/75113166437.pdfIn PDF document text
    • http://trubaopt.ru/content/file/10157492146.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///galegurufiwefewide.pdfIn PDF document text
    • https://begili.com/uploads/image/files/wipoxem.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/83255924194.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/sidisibinaregiteme.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/gunimelumirotepadaziw.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/82548443703.pdfIn PDF document text
    • http://ciskmv.com/css/file/dasatepupumi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae7d88f85a---gilapuzewu.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/lazabetuweritam.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/25022456250.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/balejajixujerepevinexome.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/mupakowutim.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614271d30b529---wujewijowa.pdfIn PDF document text
    • http://sro52.ru/uploads/files/zozuworuwamak.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c953346f2d---kutepogit.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/zutuzofiputenusavixikezug.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/30532213829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=365+business+loginPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/57483839961.pdfIn PDF document text
    • 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_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 17636 bytes
SHA-256: 75a414e6b0e9b60c8ea0ff35ddb7ce71409e510a4c6490c995790cc1c8b9f523
font_02_sfnt_off00012be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE0 10540 bytes
SHA-256: e685a562a9824c6aece1c6c9624cd5d0957d4091502892af169c82c3c3f2913e

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