Malicious PDF — malware analysis report

Static analysis result for SHA-256 37aee82e22e8b0bf…

MALICIOUS

PDF

87.8 KB Created: 2021-07-24 01:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b82bc95d8f8f496141c8871b0e7d64d9 SHA-1: 47a29c8adc48e8be038e5901e123e391b220f394 SHA-256: 37aee82e22e8b0bf972a741d12a94918b6b8689408e470b3b49ede812177c057
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the heuristics and the presence of numerous URLs suggest the PDF is designed to exploit users by directing them to potentially harmful external sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://carszana.com/image/upload/File/jigobatubadadinapupote.pdf In PDF document text
    • http://linhkienhunganh.vn/luutru/files/sojepudikiv.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7686dc14d602312072db03747092b5bb/83493124940.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/puzero.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/52604970076.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/47102921160.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/nokosirawedul.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/gagewow.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160902c6f1bad2---36156486133.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/38499545871.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a872d310cbc---nogisuxesibupugenemitawir.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe02ee43d4---35674465918.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092887c90abd---vopazabomakesebobox.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/6pterns6mo6t6mq9kega5rs2g2/jujoropuvajogotiwedol.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/morokunazi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaaf7ddcc2---89314131097.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/73844188146.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/foq02854keatnggs28qecuddm1/ziwosejudojusa.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/71512891121.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/oh5fmu6gdkm6nrlmule29fad31/27832400885.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990fa5bf0b5---mobopuxavevi.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608b693a3ea73---72770976065.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/tuwolupijowutijodokuwawex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mckinsey+problem+solving+approach+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3a44cd738---leromefixobobibagezew.pdfIn PDF document text
    • 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_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 11376 bytes
SHA-256: 05c2168af4fff0539ced0fb2dc08835c5c91cea0bdf6fcf23a2c7f5af873f087
font_02_sfnt_off00012685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 16460 bytes
SHA-256: 8f4b1c39833b4329393341f92e8cb559081ab69786e32fb387df48af5e1258ca