Malicious PDF — malware analysis report

Static analysis result for SHA-256 8add0adfb2176d6d…

MALICIOUS

PDF

71.0 KB Created: 2021-08-24 09:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 810a2f60da83c59f162d871957a3e590 SHA-1: 8b461aeae540533fd1b1b102e58eb27f467b13df SHA-256: 8add0adfb2176d6de3cddd957c2be859076828db851db3c9f6eb1ad826e61118
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is unreadable binary data, indicating it's not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bsp-plovdiv.org/ckfinder/userfiles/files/polojivasugusokamalefibar.pdf In PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706dad8daf9---47352835287.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/12793668686.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c953629f44---65971595769.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/gaxegovuzo.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/a6857d5057e98b2f118cf96fd836537a/vulukizelatomu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fb29c7421591aa2afe4ceb2b17cc0823/23611624114.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f6dccd40aa2381b89a64ffb980cf12ac/17805890401.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/nunutufonebatiso.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/69d950857855287358ab18c699e70e24/94248165115.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/74473263549.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/muviniromawax.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/gulamovazudoforewibote.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/famoranununexowekom.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/084a00077af17edbb80db63d7844e91f/1872645038.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27e7e83187---jetejukatakeru.pdfIn PDF document text
    • http://matras-devison.com/upload/file/sidapivogatelaguvulil.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/vawugovaxopibonofevos.pdfIn PDF document text
    • http://aquatherm-graz.at/files/bevavowiriledovetogutu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/7797135bb08567a7b89cf0ea51f912a0/furisewitojagajujelawog.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/nuxemezekoz.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/af597e16650a2cb220ce5fc58d920106/99254816971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=advanced+life+photographyPDF 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_off0000b69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69D 10892 bytes
SHA-256: 6f296aea189a1df7589ad3cda787b5550664120fea8d94c474672acfdff928e7
font_01_sfnt_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 15412 bytes
SHA-256: 6705befc59cc76f1b22778335b74a60cd025fce4688f9d1df26310e68254e553

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