Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fda499b477ca9ce…

MALICIOUS

PDF

79.2 KB Created: 2021-09-01 20:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f0b0d8eb6753a42bff4972f4f809c5db SHA-1: 1c9fe052be45a63d7d3bd0ad2441e086fcb87acc SHA-256: 1fda499b477ca9ce452d49f09642808a28df78b2d154f248691887f87fa46faf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/5oa7sf3mvtssf6iigotrhilkfi/35280498400.pdf In PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ba532ed0---77802854830.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/ritefiboxokewotudi.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/kelikutevafubuvaluwuwus.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/bfnlust6enq214jt6rmfuu8np2/xitij.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d032ed4c928271e40e4c63c1e12754c1/moluvijobupogukumakor.pdfIn PDF document text
    • http://tyextractor.com/d/files/20178227750.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a03dfc5b675---kaxepogaxasumete.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/70173253228.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/vunuvofozataxifogoperem.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b99d8c60a68---89629399030.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/tut1kilu3nf99h2ndj9ib7rslj/vilamivozevesorox.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaace39c04---86236848583.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/69359761779.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/64769676984.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/b846dce8184eceb896eaf4a887972b4a/maxewuvuginetakilaxe.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/bowogef.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1cf955a44---84452988520.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/kolibemifisewalusux.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726d023c9b8---legadavoz.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/m8hgfvh7aqkqp15ucg75euid7a/13786734625.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/wilarifimiworudipagevamu.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/kazazumufelugejoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=real+time+example+of+multithreading+in+javaPDF 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_off0000ce5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 11220 bytes
SHA-256: a101701bdc5dd60334e18a9682ffce5467c85c5597ccf19c9305a270d1a346b9
font_02_sfnt_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 17488 bytes
SHA-256: 74eda660bb517549124cac88756ef9541249c51cc2ce3d63251d0635e498c75a

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