Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e4dd0d8cd4b72e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-03 16:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bee4bec0101333c5a180597891947798 SHA-1: ed0ddc8eab89b128d26798b95580ffade6a34a67 SHA-256: a5e4dd0d8cd4b72e13734026002e924eab04c32f434737162d762a393ba0c154
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites. The presence of these links and the overall structure suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=cambridge+english+advanced+2015+pdf PDF link annotation
    • http://allamericannursing.com/userfiles/file/simorobawesegonoxo.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/10674141713.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/eab490d07d90f5acb741411c5d4169b0/walodawepaf.pdfIn PDF document text
    • http://steinemann-ag.ru/24847132508.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/83260950987.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5dde5cd39---vatusususufigalekerusesu.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/pilalepemivekinogavib.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/lebofibukasodibitajexor.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/79648969763.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/nojunovezukul.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/51406610769.pdfIn PDF document text
    • https://iword.de/userfiles/file/poxorulonakixudu.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/11924872280.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/61077896766.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/85787653699.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/16813734580.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210513/2105132203173015254epz1gl7791f.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/12095c62f6ba2aa6a1b040e722e602ef/xoxagazov.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/74894279633.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/69571235056.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/niduluti.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4199ba14f74fcb00807ddc0704eee4ad/tagivabekomo.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/60833994414.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_off0000b393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 11512 bytes
SHA-256: 16fb61a0541478ee734f37c1eccf395ae46fafee289924153eea56a153bef7b9
font_02_sfnt_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 15444 bytes
SHA-256: cd384fb1e0e7f67d4b40a35f08fc8466e9ee33a8e0210f83b3f30ba6b7a09411

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