Malicious PDF — malware analysis report

Static analysis result for SHA-256 1236b5738791c868…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 06:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f3a02a34100fe4bb540c8ccb708dd45 SHA-1: a6e235f45fed0a86410b03efe09294969ff0f3bb SHA-256: 1236b5738791c868309f7240c2b7844a340bb4ce231fddddc1afd1efcad20530
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, including compromised CMS uploads, further suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://mastervgtour.by/var/upload/file/86718850591.pdf In PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/90482099221.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/58101405408.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/soneweduwosominenivimuwo.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e95afe36ffcc8e8bf3c8a7f0ee1bb965/39737287513.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/37315288907.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/61559069666.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/52654082480.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/7v09ve5n1ph677f252tre80amu/71605021050.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/25698699158.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/48671839449.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613beebeeb79a---podigeroka.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/zidejapotumusojoveset.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/bevaxilewogupivaza.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/fewigilitabuwilopegol.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/latopedibolivap.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/24233527818.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae406ddcdc---lijexitodimivolawokomiso.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/o7d4qkapqkdrm8963lejtrua37/94116480934.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/gelet.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/lijiz.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613493aa71c51---badogelofonigo.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/xekelozurimufenafozudik.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/2711001498.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134b1513719f---xexovotifamok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+iphone+wallpaper+movePDF 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_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 17576 bytes
SHA-256: 52cac3dff45ab9c7653c1ba833428257a56dacf111c570e0b16887fa7fc869ff
font_01_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 10584 bytes
SHA-256: 30bc3392597b74cb6b1f8fd061d4c4b038d427d1bb06e4ffb26d4ef0abca21b3
font_02_sfnt_off00012781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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