Malicious PDF — malware analysis report

Static analysis result for SHA-256 d189c7d741eb9b21…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 17:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 087d990c8ce3afc75cf439f089ffd24e SHA-1: f94b5313338e2555290cc4da23f7421be2787f7e SHA-256: d189c7d741eb9b21928d6d762573eaa8b022deb827b889cdcc426efdf722d3ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://grubstreet.ca/ckfinder/userfiles/files/nizuf.pdf In PDF document text
    • https://lalicorne-hotel.com/userfiles/file/dagaminumisesiwefasef.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-13/20210913145418888475.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/mofudibenosatetab.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/jebekipevobufemoluzaz.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/88153199679.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/ravamodosetokejir.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rnb4au0qlgfjuqac225nivgge6/20343365431.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/80838724857.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/nogisiwuwamixunipabowuli.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210902_BC382C909B76F8C2.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/49858783872.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1b3066786de930be758e3dc7afa7088e/tezoxovuvub.pdfIn PDF document text
    • http://okvin.org/userfiles/file/madadi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa12789eb---jifes.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10cba745e---14908202599.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/saketirugokamus.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210908_338295A3A8E1BD90.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/vamev.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/51941247168.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/navudunefe.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/wanesobilasubegileba.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/jepapaparamugibakosara.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/3386582548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=d%26d+5e+player%27s+handbook+free+pdfPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/dubisowepuzurazawopupedo.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_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 22080 bytes
SHA-256: 96cea551f69e079f013a48826f02feaac390dd78e29340a4eb9eb673fc6f2c9d
font_02_sfnt_off00011b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B05 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8

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