Malicious PDF — malware analysis report

Static analysis result for SHA-256 e288acc142b29a76…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 03:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c793afcead58358cdd7a5b419783ee24 SHA-1: b4f486026dfded1029f1524fa443ae1bbddb0b9f SHA-256: e288acc142b29a76fcada4dd2fee35d2ac92a215a9e144cd95af7c88a05ee2aa
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to a phishing campaign leveraging a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://ciatic.saintelserver.com/archivos_editor/file/xomivegadufesodowino.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad5e7e841e---64300442597.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/64779757250.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/dupudejipalunakezibidus.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/apbpjan6ih40h30dkg7gqsmlb2/dufijazu.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/44379392496.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9f79b9bea---tutejoraliwajivawemoxemu.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/wanunuj.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/dirababunonawokupa.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/femugabikezisegederogixur.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109191116101270.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/29682984080.pdfIn PDF document text
    • http://dd-eng.com/files/files/juxuloxuduxilorabagotoda.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/jaxomojenuzuful.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/65623442492.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/41410948778.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/40119841053.pdfIn PDF document text
    • http://sentai.cc/data/file/20210909_001002_713.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/bilaler.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bc574699076fb29a60caca133df1bd5f/putovuxisewupuvabinegebag.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/magujolaxofim.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/93792831244.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/91815897354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=starting+up+love+movie+watch+onlinePDF 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_off0000ae27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE27 14908 bytes
SHA-256: 843073e6f4b9aec36a0964c8c06ea2bde4767acb2ee2e12ab8dcc89b52892d6d
font_01_sfnt_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 10980 bytes
SHA-256: 24a4c6f7342d14c3ca7ccafb14dde746067a319d082c680e902f5198d2b12fa0