Malicious PDF — malware analysis report

Static analysis result for SHA-256 34660c30469f14b4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 12:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1270f66d4f24f000ccfc75a445340153 SHA-1: 7957cfafa264bf075bbbff20978ff0237d8b353d SHA-256: 34660c30469f14b44d3b0df0ba0afe9e4eae9a06078195d0444665803b8b1dbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://allytemp.ru/uplcv?utm_term=how+to+make+purple+ink PDF link annotation
    • http://megaprestige.ru/uploads/files/56678173373.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c93eb4002a9---wanikizomukemivikiji.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/67701305015.pdfIn PDF document text
    • http://gojjang.com/uploads/files/labujawupajisafiboxes.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093d39f2b2c6---seseju.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/gijubedosixadaj.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1627289075.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d972d30de---wipizidulirugazul.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/60264362559.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/li1hgr41bqf335bs9t3545holn/jivipan.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/lb2ut1llbu5v1a06qsuvtbln9r/40395991588.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee880779d62---56273930935.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075078a9cf84---64415880500.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7er0av6b2nfmrnm58p3s4qdf98/piromexorumejasotikezol.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/tavijosagimebu.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///zotesasanuvumi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c428174c95d---94715810951.pdfIn PDF document text
    • http://marketingnews.fr/images/file/28871582168.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/8517331046.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/64194685620.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/34744130464.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/vuwebuzogisusuweditofeweb.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/03799286283a7a8a0c41f88c8278b45d/jufuwuvokivosukitaxob.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f315a8323f---72721868650.pdfIn PDF document text
    • https://birudongker.com/contents//files/44857307784.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/guruwowemupitogateralub.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_off0000de22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 10516 bytes
SHA-256: 4d675f793761cb9da0cd938eb2aa987bc00ec50deb2433ae346d46fca8489d3f
font_02_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 17268 bytes
SHA-256: 57314f0f89cd0af80f9621c4278c4c5ead7e331b85402948f59e7dc90698e63f

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