Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8d7ae06f375aed…

MALICIOUS

PDF

91.5 KB Created: 2021-08-06 22:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 803d83695313bd066691162dbe0126f0 SHA-1: e0cbca46b9a986ea049944dde09f1c001f886cbf SHA-256: 2d8d7ae06f375aedaab91b9995d18a280b553de967ae79ea06e91141d048c4e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and detection suggest it's designed to redirect users to malicious content.

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 http://cristalensi.com/public/File/56555331882.pdf
    • https://ocw.tw/uploads/files/mekufotidusumida.pdf
    • https://triosms.com/userfiles/file/jokitogekexomoxefuzanop.pdf
    • http://feynburg-uhren.de/uploads/35530644926.pdf
    • https://247christianity.org/fckeditor/userfiles/file/11705147551623473905.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b715e2421c0---gamozipemabosagilakop.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/tekokifagegetetif.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/redakiwitufowoxi.pdf
    • https://mps-india.com/userfiles/files/59316175738.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085589117c4e---1409442604.pdf
    • http://www.urbanwaterways.info/files/rixorelosavizetotorizen.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726d4e72ee9---79280849295.pdf
    • http://pphjako.pl/userfiles/file/77415247009.pdf
    • https://poolpoint.be/uploads/file/35293703868.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/12933630523.pdf
    • https://godahoian.com/app/webroot/upload/files/buligerunebafijilonetowez.pdf
    • https://aartipalette.com/userfiles/file/61870419151.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c77963f12---dugokij.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e954ad9f8f---2257595489.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160995ffcab4bf---sowaxaxibofevirom.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/20771955066.pdf
    • https://lotteppta.com/beta/assets/file/morizatixirijoxejaguj.pdf
    • http://www.aportecnica.com/imagenes/editor/file/63568045597.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i79am2e444etpcm95ibkj65vt0/98321786845.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f461e5e090---75214042639.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/xenuzidipepafozagevusiw.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092280ac2374---kifekitozunapakukoz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=food+presentation+secrets+styling+techniques
    • 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_off0000fdab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 16792 bytes
font_01_sfnt_off000115bd.bin
7d643b96d569c2636238f69021e7ea5252304b6c6eaace012b891cf431bcff92
pdf-font-stream PDF embedded font (sfnt) at offset 0x115BD 17692 bytes
font_02_sfnt_off0001442c.bin
030701d0c5b240fdee0db2cd0aa1cdfdb0a8e4c5eea2c2ee014b056d92489251
pdf-font-stream PDF embedded font (sfnt) at offset 0x1442C 11132 bytes