Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df28a35c5c63ae5…

MALICIOUS

PDF

85.7 KB Created: 2021-09-14 04:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d625e29fcd82dde7d3e48adab2fe662 SHA-1: f932ef0ed165809f60e49732f3a4dd84fa2420ca SHA-256: 2df28a35c5c63ae50f815202bd94605e62373f8abd5ff6d4707a2e62f4cb2eba
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised WordPress sites, indicating a link farm designed to host malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple unknown URLs associated with formcraft uploads reinforces the suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a7be2bd9d---ritusenotowowuxupuki.pdf In PDF document text
    • https://grandegroup.net/files/59028948640.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613f39b50b5f8---rakifizaxem.pdfIn PDF document text
    • http://trivio.it/userfiles/files/lokupekopudoluses.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/ramezuvubine.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/binuwosu.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/7785202260.pdfIn PDF document text
    • http://blueyee.com/upload/file/07125514304.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/nabufenuwazatowiwage.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/tujilalofotejezeferobu.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/zixerunave.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9155c878---dekoso.pdfIn PDF document text
    • http://henca.com/files/details/file/gadofamutajurorovenadoped.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109131747065363.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/fotuwinurabivuseli.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/92721718552.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/lutekifelekojevin.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/jefovole.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/54955011098.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/59014351507.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/garukipomito.pdfIn PDF document text
    • http://yuli-china.ru/d/files/virijinimar.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613342762126b---zujudonidubituxozeve.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2e455799a---rokiguwovegitegogerataz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+add+printer+to+my+android+phonePDF 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_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 17812 bytes
SHA-256: b743513f671fbbfb940a0013503c66fffadf2eb7469742ae3f223dad0046131a
font_02_sfnt_off000130fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FA 10636 bytes
SHA-256: 0b507ed80a3cdd78ac7786a44f04d94cae19dcdb72baa0a249a924d414b3ff69