Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d354c1c9b327fca…

MALICIOUS

PDF

102.7 KB Created: 2021-08-03 09:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f70bc8f8f1713cd9e5f8171a3cb4fe15 SHA-1: ffb7d1abdf78792a40fc83bd4c4aeadbb3305055 SHA-256: 5d354c1c9b327fcafaea1acbf34e95e5d33d89aae6b810778781c554a152c432
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://medvor.ru/uplcv?utm_term=teenage+mutant+ninja+turtles+2012+season+3+episode+12+dailymotion PDF link annotation
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/tizegiwuxexidegibom.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/81c9ebf62c1d53296abc269eada0194a/sobisiwijaxobu.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca8429318---97906358795.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ne5urka50o9utaamr9k74n42qb/sufumesenonima.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/rofaxofitojakojivol.pdfIn PDF document text
    • http://sun-eko.eu/files/file/1414060681.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160816876ccd78---54225035976.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210717005829.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/91722189512.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e8fd9320e---28287590695.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/64381563554.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/53ac00fa083a0d9d36da4e8c08b3f225/junujezivatilaloguto.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/gagijatebakisekatowiru.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092107a76c43---76124492976.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/94892759950.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/62069096371.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/mizirotasasekesit.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/97277387367.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/bariwadivajevanivogaz.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/wajut.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/5613269236.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4c5fed58ef831173a220593d644cd552/suruparilowitiwezarese.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/87228042650.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6f74af039---90429956385.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/vajese.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_off00012b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000143ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AC 17268 bytes
SHA-256: 684917f2b6e393923e129840c973303731329c609baa0e614356ee118fb06881
font_02_sfnt_off00017136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17136 11508 bytes
SHA-256: a1d9ae9ed95166cb6df6247322d6ff1df215ad253b6d536e9d2153336bc59148

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