Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a08c0f48430ea59…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 05:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f6be9409dd5f341c46ed04e235d6d37 SHA-1: 4a0a9d1a7c947400618aeaedcb61eb87172bce16 SHA-256: 7a08c0f48430ea59cf86070df128c7dbcf4c1f2c4e8f8067c243c4d829701d69
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://medvor.ru/uplcv?utm_term=android+studio+run+on+emulator PDF link annotation
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469226e42db---48595154763.pdfIn PDF document text
    • https://securitydm.net/slicice/file/nagetavaxa.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/gefenu.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/16357999539.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/pijirozuzonudumi.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/7a6fbb4fd7b2bd630c14edeed0e3d00d/14669573722.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/numuxetitupetig.pdfIn PDF document text
    • http://chamdure.com/DATA/files/lelerozitadunib.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c91aab5d---19602885509.pdfIn PDF document text
    • https://ksuskalology.com/images/file/68173389640.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/vusumojem.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613479ed6bd97---16836783336.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/41027667475.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/9287466071.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/50020720141.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/31528167113.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/vanararutolug.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/28648154114.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/67133968050.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/xositugo.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/pajoweridilivijo.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/goruzopagulevim.pdfIn PDF document text
    • http://klenderbio.com/upload/files/figeti.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7debe844---40023049970.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd10a9382---susuzatutofisilaj.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/sijevonowasemuxo.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_off0000db2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 10488 bytes
SHA-256: 34e5465672e6ec82d6c729b880d35ae8bcae62c6619845304d55ffe699454bdd
font_01_sfnt_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 16564 bytes
SHA-256: 29ce49da9880fc3406e61c0ef57eab9d9e6dc6096b23256566f49010658b8614

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