Malicious PDF — malware analysis report

Static analysis result for SHA-256 8559f67bf3970d4d…

MALICIOUS

PDF

92.0 KB Created: 2021-06-26 17:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0430680dd4a7e8a318be3c323b7f651b SHA-1: caa692a22414b3df2001635b16ffc3475e9dae97 SHA-256: 8559f67bf3970d4db9a6b526c91f59fa81cfea6bfe2981d635f182941f0aa217
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kaptenhoki.net/contents//files/bejevelen.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b58d6d9052e---14971815635.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/6850e4632fa18d275dfe48378985f6e3/josewejizexajid.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/17161905562.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/420cb11a34cc50f293526e43fd1f00a1/ropokizidukasuguno.pdf
    • http://jjmcp.jp/userfiles/Image/file/47806250122.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/loxafazexubuzat.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/bifoberutuxofodona.pdf
    • https://cornerstonelaw.eu/userfiles//file/xalifexekipoba.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ruvidb5vg7pl56qm6faun2gd7m/makudefuwawa.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/mukolexejonejovatujo.pdf
    • https://areicon.com/images/file/lezesejagowagi.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/wozirarevopefidelovaraled.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kj3raeggrfbs6o84t45cthvrh5/74193685358.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf09ccb334---tirekimudesebar.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6f099ef3b---likifujiranumijowinato.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c1df61ab798a80dd69713498dd5cafd2/girosameboxolavokirobeger.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/3e79c69de50d5bda63222f5eede1eef8/giluledabewuloko.pdf
    • http://ippon.lv/uploads/File/tafawum.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8c2f734a84e5850d73104c0fa3800271/63458289377.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/v7lm1aaf70rsjpbohn2prvjlku/tikopogugenelebawiz.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53b4018520---savaxigurevobarife.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7ff0e933e---rakav.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c08bcfd7240---tikebadi.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608532b3cadf7---goxugunar.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607458f480759---85090653574.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+pick+up+lines+from+the+office
    • 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_off00010441.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 16792 bytes
font_01_sfnt_off00011c58.bin
1c7ca0671cbaf4749154f15fbcffa37026f35626f9ec73fdc4fd0c9cab72d791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 10828 bytes
font_02_sfnt_off00013525.bin
9c2af5bcaf7ddc3064157fd8851c8b839b13f194b32ad4994b9977f0c55490ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13525 17540 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.