Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6aff01e0a5df654…

MALICIOUS

PDF

72.1 KB Created: 2021-09-28 14:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 68d5063da8723a83b8ba28114c20cf3e SHA-1: 575b0d2e6ba4f92e18911d23a42bef691c5f48b6 SHA-256: b6aff01e0a5df6548fb0a42c4862f17526d419c3e5655f477f30ddc12541eb5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which are identified as compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these redirected links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b4f45ba7cecca22d6f7e6cea5030b84f/wanixugajatasojen.pdf In PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/fejerofeledelow.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132036986103---guvupopawotuvo.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/zipuru.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/vipoxuxenowafabefimuxig.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/tikewezazide.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613082a6138b2---32999074284.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/xikamakezesolefirojo.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/vitudezija.pdfIn PDF document text
    • http://freetds.net/userfiles/file/rafotub.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/wiginuzapajematoweledadow.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/42098227816.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/nipobojojomaditunurira.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161406f16620a3---71768975926.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/93362170965.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/18676454223.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3bd90d07c---57796728527.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613916a837880---dezubulurebubu.pdfIn PDF document text
    • https://sledovani.gpshlidac.cz/www/userfiles/files/17284275454.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/11935103199.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/17302649262.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/tafesobagoxumolupukunusip.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614caebf6de94---jupuzipep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ppsspp+for+laptopPDF 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_off0000b6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF16 10024 bytes
SHA-256: ba37aaba6780e9a43cb8dd74956535175b3c8f347a880398915e17b731d483a8
font_02_sfnt_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 17724 bytes
SHA-256: 7a3aa6f23746d8d1b004b6ac1aab5194e405f34a4b39cea3ab1d164cf4a3b34d