Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f70f6273fd480f9…

MALICIOUS

PDF

112.1 KB Created: 2021-06-27 03:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e0775ea6c8b19b39ac4674d94c149368 SHA-1: 811dc62a7551b2be5431936aa3a771d4de5fb04e SHA-256: 3f70f6273fd480f9beb08ef9634d294dfb18ffdf7a7433e1cb65a14096505b79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to exploit users through compromised websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa7494fe1---22966190678.pdf In PDF document text
    • http://chonburi33.com/userfiles/file/3516719452.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/hs70641aa3gf1qel9ko1bl0v05/66064206006.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad46361327d---86290199244.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/270bb8897d66d2cf7970d42f671bc52b/98085530776.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/bamumevunejokakanaterotub.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a480433b640---21373670619.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed72f0ccb8---5576200189.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/de8a96dff8cf9926bbbec0bc14b97f3c/89158971517.pdfIn PDF document text
    • http://zjxfjc.com/uploadfiles/files/81228457877.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/funowepujitununamolexo.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/xopeparel.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/15779114802.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f336e073b---resegelekorunebixarukuvij.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1debecc870f1a47e0a7feb1f2099a3ba/sugutas.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/6is5ptc8ibousfccb95q8kqn5e/46173022483.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d21b5f7a4d7---30168403033.pdfIn PDF document text
    • http://vswet.ru/f/40049878566.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c437df39f.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ae92c2387e658df144b79e52a6f20d56/72903421379.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/koligozan.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/gopajodogututotalo.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/topelamesegomiwe.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/75453314010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=author+of+vernon+god+littlePDF 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_off00015565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D7C 10452 bytes
SHA-256: 8898268f9319aaebad61765a6ab3581a23997a4c2a21d66acfe027c1ae16d34d
font_02_sfnt_off000184ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184EE 17696 bytes
SHA-256: 1e5e742d68f0cf247c7efe56b4b4d078644952242b5335aa3bf1ccd35b2fbcda

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