Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f91994669fa919…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 11:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7046fa23b18bf50382239e6aee62a17 SHA-1: 2cf032dfa1d6fb721a189e43819d6eddc39869dc SHA-256: 46f91994669fa9196dcebae27c30d97f0862726eae722208f877665f1b82ec1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging indicates malicious intent. The document body is heavily obfuscated, but the heuristics suggest the primary goal is to redirect users to external URLs, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c889da6610d---majagipituvitagu.pdf In PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/70289106543.pdfIn PDF document text
    • http://tayles.com/uploaded/65221873078.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-7-31/20210731045325354829.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/dunepejun.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c40717ca---foxatogapusakonazigidexut.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/turovokabuku.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/gigokitamuvusozonapabo.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/80249068142.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d699e077---netuw.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/158d241cb5c82e5f0b5669435b09fd9c/23071085854.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ea061ce18a8d82f59d4c9795af643542/nikaguligovabizafuwewox.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/fukurup.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd7466884---nurapubikenena.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/lufebelojevosowi.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/65764403513.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817ac18d814---42704619859.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210609_055218.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/56349967986.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/kivamibazewi.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/48587306354.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/29801243775.pdfIn PDF document text
    • http://rayanchem.com/d/files/13907811321.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160850949a48db---57189288533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+unprotect+a+worksheet+in+excel+without+passwordPDF 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_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 10984 bytes
SHA-256: 46d7e2577e0c74cae617e97c49e142fdd476d0ab73a62311d600ab49aa7ad212
font_02_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 18780 bytes
SHA-256: ca821249d248b7dff3e3e63be7341c1e75d1d0c4fb355d3ce7e080dd85a7144d

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