Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfe67adebbcd596…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 09:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d0da2299faf072085d7f166ac9434fbc SHA-1: d448b83b8bbb69ee88d1115eeccb7d52aa5cede5 SHA-256: 1bfe67adebbcd5967e08a5ba8dc11e6f34e3371c610644cd55ff09ff22e327fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://a-aqua.fr/ressource/site-image/files/vodovunerodolud.pdf In PDF document text
    • https://highlander-inn.com/assets/userfiles/files/fivixepewefi.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/43085190065.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/39128589636.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/watuxufuzi.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/7644798483.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/wedovasuruv.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/91890988089.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/gimawepiwuk.pdfIn PDF document text
    • http://awards.nl/img/cms/file/11422744822.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/50966326757.pdfIn PDF document text
    • http://netart.hu/userfiles/file/61156905694.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/23522137085.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/39630443876.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/39412321941.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/wKmuRZfgQlBW.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/fejovepidavosujilunoravi.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/sokowolofolegunizaxufas.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/pizixeriworo.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/nomareboxiz.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457d6ca1381---21563258370.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422e5c2f9de---10186370256.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/99628170991.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/o80il9mcn4b2bvftirda3l4ho9/mejekatik.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/72234022118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+sega+genesis+emulator+for+androidPDF 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_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 18156 bytes
SHA-256: bdf6a96830633676d86fe02cea902d417f228fd21fbac5530440867541bba515
font_01_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 10848 bytes
SHA-256: 7f66b510f1070af5064cfe7a010316038ccc4f6b48f3c8f0b7c5f71693ce9869