Malicious PDF — malware analysis report

Static analysis result for SHA-256 b052ff9562357680…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 12:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21f58017d1f812c353e4456b484268a0 SHA-1: cea7af1380d723f1f4b907e24156982d6a3106e3 SHA-256: b052ff9562357680a0fb95ee985862c0ea67f27ef80b0532caf6ffbeb4490055
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous links, many pointing to compromised WordPress uploads and disposable hosting, strongly indicates a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://godahoian.com/app/webroot/upload/files/37690149187.pdf In PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/92928415833.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/56635160467.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/nofifasefetego.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/20899054938.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/ef4532c739c86dbb5ecad6e050b2c748/93689656045.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/1895342864.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1ec09ed01a6e7bb3fdf76df3cbb9f8c9/gonibetelebimifupenawik.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed5a3b3953---34416652728.pdfIn PDF document text
    • http://unseretochter.com/images/file/26090886796.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/66335042562.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/notevoruron.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/2fe7b037d86e9328333e5aa6bcc74d62/7635549806.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/xosexivaza.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/lilukidalafizasekumo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372b06e3efc---60860717160.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/padiwixag.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/muzisinitosanogumexotip.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/80814224748.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/suboxosavip.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/lvgfd91dav9vr4jcqihhtfhuos/53615763013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=2017+ford+explorer+operating+manualPDF 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_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 11120 bytes
SHA-256: 727bfb2a4d51aceb74da87614f9481ca0fe53f782090c1330566ccede76da80f
font_01_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 18188 bytes
SHA-256: 1d162ca8539ed83dd3b072c9d2900f78ae212d6700e4fffb0a965853ce205dc7
font_02_sfnt_off00011f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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