Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64b587d3c1f941e…

MALICIOUS

PDF

88.9 KB Created: 2021-06-28 23:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 16d9fa3bb7f11266543205c643891e1b SHA-1: c7143af34c82983ca69f1e412df3e83910f7e645 SHA-256: c64b587d3c1f941e0c8c36a6268ff68ef6b45924034488c476a7f4fdb80f4e00
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The presence of numerous unknown URLs suggests an attempt to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/725e8e8b41b9b15d079bdaee4955ea35/lotojexusikegojomun.pdf In PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c65ad1cd73---gapebuvisudizajep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608058091bdf4---89210806803.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097dbda7b0f0---konosoxubilelovuvev.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089eedf8853f---dijewifimotukibojopefuzil.pdfIn PDF document text
    • https://taperagi.com/contents//files/68412409945.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/40665916609.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/4115e69ef584dacf83e68453e74cb795/waxeributuxizamupa.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/turolosikupemit.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33b200589---bebukagitu.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/pekukizuforerosaredi.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/38066459051.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/nekoxaseferitapikomuk.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/22266274881.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/43262294458.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fa4c7eab5---92475594170.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/geguxokefamok.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/99487545100.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e7a6e02f0265c369c1c90c149567b078/kudutogonovax.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78976702621.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a8880a8a---rekuwejos.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/2e048f5edb4fb5edebbec68e140154cb/7110417106.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/46551018981.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c1929246a1117144ce6ac1e71f59e12e/zudamovixanula.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d31872f9d3ec4925d2197183b225a752/90203847044.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd2136ee39---23418283555.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/54246713490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=renaissance+art+and+music+crossword+puzzle+answersPDF 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_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 17432 bytes
SHA-256: 7b90ce8815988f6941e606086d5890138790089ccedc02e9aa1600b20e9dc4ff
font_01_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3C 10964 bytes
SHA-256: 4da78782bf50c7c5d45357fa1d6ba10a9c4beb2c44cc6552b3dc9db73030f763

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