Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8b124af4d8dbbc…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 10:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6344422923d7a76e36554087a5bbfda SHA-1: 2c9bc8c480e79efbf5fa2d05ee47ba6f1ae593e1 SHA-256: ea8b124af4d8dbbc1b1be7fa5ab900d9191eb89033f21186921cf1e5f1b8a55c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often facilitate the delivery of malicious payloads or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/76959449317.pdf In PDF document text
    • https://aradovan.com/userfiles/file/20180763178.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/solibagijigozaludo.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160718d88a7d85---nugariguvisenogipebi.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/28670195991.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/gugojujopofetiwag.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3oe9mnurn9ibrbnncu3rlbbdnh/texidepurenubobarexozonow.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/59142650064.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f476873880---98639641872.pdfIn PDF document text
    • https://majubesar.net/contents/files/naluviwifomovigumi.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/89ab059a70335ec7d2de34fda514e1d7/93025258830.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/idgvir2jleiglbgvurq6g6597j/kavexavik.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073edf2d8e31---95314960254.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/tepavafuposerexejamifeg.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/43411018937.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/mljfc4j2bkkab4qa6nh4to399j/mebeberodepuro.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/91995478355.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8052195e7---mugubufuzidapizileranuzi.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/fejaliburixowafomuke.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/d7sfh8llhioa25i2m9cqofefa6/27118731973.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd0ec219e3---64181903736.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/wozidivizuvila.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da45101727d---84569044954.pdfIn PDF document text
    • http://sgpeo.pl/users//file/pupipebujutijimefijag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=solid+state+chemistry+pdf+class+12PDF 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_off0000be2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 11144 bytes
SHA-256: c068c490a4dbd347ba9522bde25d077184e618605ffc9742305f1bc2596f7b3f
font_02_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 16892 bytes
SHA-256: 81b4366ce826b22511211319108323eaad9a4127d3330973615788c6b9837ebb

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