Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfc189026ebb78e…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 22:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8b02899fc4b8d77e482c146db2a3718 SHA-1: 4abea425a978110a1053b2aadd78f6a32ac241c8 SHA-256: 6bfc189026ebb78eb6ec21553166fc2bf8a5fbecf717e0ee6a609e6a2be69a20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the embedded links indicates an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://queure.ru/uplcv?utm_term=kodi+tablet+android PDF link annotation
    • https://bimstudioinc.com/media/files/45113759943.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a31b9b99b11d8ddbaf2e483d1ee05b65/losume.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/pituda.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5a0h5j3hb4puosil1rkgl1a5e1/vevojunifo.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67926382733.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a91a6c424---mofukonufudomutigomuru.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/falotes.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/70952021042.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/silabivew.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/wolagafodifatepe.pdfIn PDF document text
    • https://digireg.lu/upload/pizesukolototawibigobipan.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd248c5240---fatofadegumega.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/38042183995.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/49470874221.pdfIn PDF document text
    • https://remini.hu/userfiles/file/ridukaxawijojenovimig.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202192547312953.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/3701270747.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210905150600.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310910d4ac1---mubetewopekumezamib.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/sujuzinelebetovejekig.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-6/20210906182204869075.pdfIn PDF document text
    • http://xycrusher.com/d/files/88742790305.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef460b2076---duxupotixagadogibotug.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_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 17432 bytes
SHA-256: 892076866a80c4668e46b05d03147bce74c03552505fb31bdba4639378192e47
font_01_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 10204 bytes
SHA-256: 0399c61f92be9e2f89d4c46a99e3c1e8a2a391bb1575584a00c5e5b51d3b4463
font_02_sfnt_off00010d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.