Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec391eec8ad6c88…

MALICIOUS

PDF

90.1 KB Created: 2021-09-01 05:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 04499b2d71317dc7bd0c662f0a6e296e SHA-1: 28fca82d5075b6510b629419fc86f2d1dd98d922 SHA-256: dec391eec8ad6c88a519f594237a82bba146e79e47fbeb15e9d41e0a9af754b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=human+rights+of+prisoners+in+india+pdf PDF link annotation
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4701984a5ceadc088df2f04bd6e65990/18777680920.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/44932767072.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/40199143991.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/nlr71955tp9kq0vu83tdfm8vdp/kopasizenuvidofusu.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/fefowu.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/numageti.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d9463bea---72764939144.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/32286733583.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e59c79f0---xatudebolokijegedet.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/2dc95c13cf7e0908b50d04ed070fb92a/vavinononisokomiro.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/t540bi1f22p78iqdicsd63hpr6/42215952469.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/vamiwuziganuvetozobiged.pdfIn PDF document text
    • https://aedwea.com/upload/foto/3738029706.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ica2g7aojc3e6jdilbsea4qurn/82875948601.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/38998820962.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/35068162236.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210628_204319.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/fd382a6c09ba8a33017351d88e93b967/83866923860.pdfIn PDF document text
    • https://aspirans.com/files/file/mefuvuserevuge.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608780ee4c4fe---64335863180.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/88087103237.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/futezipinokapem.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/o4hsoelg1dnn3n8e6pt5lkuam5/raxinapuwo.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_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 10992 bytes
SHA-256: e79931c26beab6050c93aa109359dcc50f669cacaf1b27441a79dd2b2d5b63c7
font_02_sfnt_off00012c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4B 17728 bytes
SHA-256: a34de5542116042b92331ddbb716fe9a5e8bdc94a8c8120cd1035ad78f13e6a4

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