Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aecceeaf68b3f07…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 12:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c71eda1811c8e3ca7dd03dd124777550 SHA-1: 712f45d1d22c8b166b1b36437d08026db4fa5892 SHA-256: 2aecceeaf68b3f07ef355732995b029f8467ab3b0d31bec7ed3826812efe854f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage lure or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd2f0afa73---renerun.pdf In PDF document text
    • http://brenno-tojestto.pl/userfiles/file/59137583264.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e86b91aa53ce9f80f9c8d663154241a6/12409350079.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/77419385769.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/3694666626.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/76533605753.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/moxirusagukojutadik.pdfIn PDF document text
    • http://irollee.com/userfiles/file/49002822249.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cdbcda0007e1d927565bb4a87bfc2d54/50702028103.pdfIn PDF document text
    • https://viceda.com/userfiles/file/guretovigenijefut.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f3acb195802fb15c74e467860ec91122/larew.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/puduwinakikazilonoma.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3fae1ddb2b133f02e7459ea61ce4682e/55975904116.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/15793943330.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd776c378f---86857789478.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/bexinuxawojanukebixilib.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/mubilabupono.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/79034120209.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79e7a2bda4---85730207022.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/kemapozuzuzakuge.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/lnvnjd2h715ns004ep9cdd8e5l/rijajagojopugukunilokobe.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/xalanizixamonevapelekari.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/71449406663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hypogonadisme+hypogonadotrope+pdfPDF 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_off0000c628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC628 17956 bytes
SHA-256: d9426659d6b9f860bd193754a39d255056b7416849a6e35c0dbb8e6c4f6fef85
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 11004 bytes
SHA-256: 3093829baf3fb7d871a9609cf3fc88e72dd588702bcd7caeccb99db9c5ac2216
font_02_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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