Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7208f0ae4a5d99…

MALICIOUS

PDF

91.5 KB Created: 2021-06-29 07:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 006f1f3e68b4bc6e7c8f8ea2831a7e8d SHA-1: 624ff60e7c60de4b9e2547cb9615fe5a5d474db9 SHA-256: 4b7208f0ae4a5d9992e2a5eea4e3478d3e5fec6886f7f3b1c0fac06e13fb9304
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://laborke.ru/uplcv?utm_term=new+real+book+bb+pdf
    • http://4bx.pl/public/file/sejutowapogolumojedo.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9cef1c22c0b20b5d840d1575a951735b/favowibamitusojesomiwefen.pdf
    • https://malashealthcare.com/userfiles/files/simisokijafiralekozot.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3hn529v6vp3batmms5p7kjjmko/palifudanelifezu.pdf
    • http://thietbimaugiao.vn/Images_upload/files/nabemidinawak.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/uk15bu78tfg3lm8hnikduleakc/36997952374.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/47p12u5a5i3jhl7bh0ks45c9q6/wukogetevikujejuduwejirep.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8922bc417---xetokizewisaturaxorafej.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/dfbc593ba7af0c18903e9b68f5a047a9/34847248092.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/44010149874.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073e90129115---5203075370.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/fbc5897e6efd75aab50467d40d0a0405/jutosafo.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609281a295999---pivuwekeveburabali.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/967h3saf2ien8fspq2e4m7k383/xadas.pdf
    • https://paymentor.nl/uploads//file/wuvuluzimevemirujilixexu.pdf
    • https://alutat.com/data/file/malaxavukolov.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/1c922332d66eb64aab8d5d1204757957/47397633248.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/zunewaxexoxuxizelor.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/poilhhlbrr7f1ovsve9jdug7ve/99734042836.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a9141c4aaec0444fa92de7f03f5e9604/neradirizokerigemopefe.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0458037f---betowavanuxevexa.pdf
    • https://musikkursus.dk/userfiles/file/47201238097.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/b455ec798b9e00f37ce7dcc2c91c5176/69542417978.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5500b26f10441f4f95adf6cdec3becfa/32197514078.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 16792 bytes
font_01_sfnt_off00010548.bin
e97b4209863ce49036550d2b82fea8e6871ba6656a43711e235d0fcbaabbdd01
pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 10324 bytes
font_02_sfnt_off00011c7c.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 16092 bytes
font_03_sfnt_off000131bd.bin
da8ff5e647372946b6b1080b0fded257f42418b9872a54452e32d7e8619ea817
pdf-font-stream PDF embedded font (sfnt) at offset 0x131BD 17152 bytes