Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f5eb6d6add7591…

MALICIOUS

PDF

114.3 KB Created: 2021-08-15 13:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec2150fe2449016586323d1c33c69de7 SHA-1: 8d66cb31e4fbbae16f743e874236b63913780b4d SHA-256: b7f5eb6d6add759147af45a25cf337f689f9a87bf2c395c44843da251dcda824
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=is+keira+at+kaer+morhen
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608093f63f3df---godepixegom.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086874f83ae2---4478590502.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/vaxilisavudavez.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/su4q25r9kg2n0chof66v0okn0d/72364831801.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d836990a9---1042900089.pdf
    • http://temple.mo/userfiles/file/40319595223.pdf
    • https://ebooksweb.net/files/file/21025961112.pdf
    • http://lmleadmanagement.com/userfiles/files/duwovobumipolipim.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8cdb1e67c---64058433242.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2c4048ba---87111280250.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c057d16a3cb---rozapafodabot.pdf
    • http://cochu.net/resimler/files/gemikixisesizeb.pdf
    • https://greenways.at/userfiles/file/xenuzu.pdf
    • http://rajskiewakacje.pl/userfiles/file/55188354305.pdf
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/xopukebemiko.pdf
    • http://adveotec.com/img/file/zepavi.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210720100450.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/384d9d9b09d9ed0a229b7eb652f526eb/zinufat.pdf
    • https://dialogueinpraxis.net/files/docs/daluwujatadinuf.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3e37467b8e280e08a9996b1e191725a6/18480393381.pdf
    • http://artstudiodesign.it/userfiles/files/junukerujuwuxa.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1b3c59e291d0e34cdcbba3bccb5c058e/xebifozenifu.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4dd8dbfed---nifupavipadiwalarilonej.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084940f8b76f---jumafoxaweta.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cad4535b---4308808766.pdf
    • https://olterus.com/contents//files/xupotulagi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e95.bin
801d54377a4b7e51e9482b383c414282ff3b323e6967f92296493335bb268f8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E95 10372 bytes
font_01_sfnt_off000175db.bin
630fa0a22e3a8f9562218c5b196459081450e98a46fa0678df442bee85e6b8f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x175DB 17412 bytes
font_02_sfnt_off0001a333.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A333 16792 bytes