Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c8adbdd12134ff…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 15:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b39c0239ddbaf582f4403320f382a33 SHA-1: 1be9e912691d042267df78a3fbed9fdca8d8ffe5 SHA-256: a8c8adbdd12134ffd4c6a71acd3a95be754896a519acede438a45f8cf6867b4c
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

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 http://akcjonariusz.com/UserFiles/file/56751048351.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0a33292d---paxudamovofefoxogaz.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/u4u729citprrqp96328cc6m0q1/62584017550.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62aead0827---rifawomoxazo.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/zobup.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/98336988334.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4a77629b90cd766b913979b8dd61c7a7/vanibuzurujafoduzoweb.pdfIn PDF document text
    • https://adikketiga.com/contents//files/pisapolesuzixutasev.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/rpb7fom0r9sev4jtbt9oq5mvnb/numironulizixemokanolunig.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/38686887911.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/38238108946.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b99017aa0e---99817250549.pdfIn PDF document text
    • https://actor-conseil.com/files/file/29972964728.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/vigamenopefilex.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/41171385996.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/10362811810.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/mapijexet.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096411a7bf05---33299106506.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/12818977338.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/gudimotijadarus.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/81329012661.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120efcadd913---kawipapelivabopur.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/rebewosilemibusavetixus.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/51b456967fe541cc9ffcab1301c0cb90/24875591397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=addition+solving+problems+worksheetsPDF 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_off0000d893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 17868 bytes
SHA-256: 906cd3280648fd7f6634db2376f7f6d5328b5469f1e9552f6f17d0f5b306b58c
font_01_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 11044 bytes
SHA-256: d57e8dc726d4b525c51802a6a55ebda539af88f84a71d6d9a80213d0ef30bc09
font_02_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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